Statement of Financial Position [Abstract] Cash and cash equivalents Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Trade accounts receivable, net Other receivables Inventories Restricted cash Prepaid expenses Total current assets Vessels, net Balance, January 1, 2014 Balance, June 30, 2014 Property, Plant and Equipment, Net Advances for vessel acquisition and vessels under construction Restricted cash Deferred charges, net Other investments Investment in joint venture Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Total long-term assets Total assets Long-term debt, current portion Less: Current portion Trade accounts payable Accrued expenses Accrued dividends Deferred revenues Due to related companies Derivatives Interest rate contracts Total current liabilities Long-term debt, net of current portion Long-term portion Derivatives Interest rate contracts Total long-term liabilities Total liabilities Series B Preferred shares (par value $0.01, 20,000,000 preferred shares authorized, 0 and 31,351 shares issued and outstanding, respectively) Class of Stock [Axis] Series B Preferred Stock [Member] Preferred shares, par value (in Dollars per share) Preferred shares, shares authorized Preferred shares, shares issued Preferred shares, shares outstanding Common stock (par value $0.03, 200,000,000 shares authorized, 45,723,255 and 56,888,123 issued and outstanding) Common stock, par value (in Dollars per share) Common Stock, Par or Stated Value Per Share Common stock, shares authorized Common stock, shares issued Common stock, shares outstanding Additional paid-in capital Accumulated deficit Total shareholders’ equity Balance Balance Total liabilities and shareholders’ equity Income Statement [Abstract] Voyage revenue Related party revenue Revenue from Related Parties Commissions Net revenue Voyage expenses Vessel operating expenses Drydocking expenses Vessel depreciation Depreciation of vessels Depreciation for the period Depreciation for the period Depreciation Net loss on sale of vessel Net loss on sale of vessel Management fees Other general and administrative expenses Total operating expenses Operating loss Interest and other financing costs Loss on derivatives, net Total loss on derivatives Other investment income Other income accrued Investment Income, Dividend Foreign exchange gain Interest income Other expenses, net Equity loss in joint venture Losses in investment in joint venture Net loss Net income (loss) Net loss Net loss Dividend Series B preferred shares Net loss available to common shareholders Loss per share, basic and diluted (in Dollars per share) Basic and diluted loss available to common shareholders (in Dollars per share) Earnings Per Share, Basic and Diluted Statement of Stockholders' Equity [Abstract] Balance (in Shares) Balance (in Shares) Share-based compensation Dividends declared ($0.03 per share) (see Note 8) Dividends declared ($0.03 per share) Dividends declared on Series B Preferred shares (see Note 8) Dividend Series B Preferred shares Issuance of common stock Issuance of common stock (in Shares) Stock Issued During Period, Shares, New Issues (in Shares) Equity Components [Axis] Common Stock [Member] Additional Paid-in Capital [Member] Retained Earnings [Member] Statement of Cash Flows [Abstract] Amortization of deferred charges Share-based compensation Share-based Compensation Unrealized gain on derivatives Changes in operating assets and liabilities Net cash provided by operating activities Contributions to joint venture Proceeds from sale of a vessel Vessel acquisition and advances for vessels under construction Change in restricted cash Net cash used in investing activities Proceeds from issuance of common stocks, net Proceeds from issuance of preferred stocks, net Dividends paid Offering expenses paid Loan fees paid Proceeds from long-term debt Repayment of long-term debts Net cash (used in)/ provided by financing activities Net (decrease)/ increase in cash and cash equivalents Disclosure Text Block [Abstract] Accounting Policies [Abstract] Property, Plant and Equipment [Abstract] Summary of Vessels [Abstract] Balance, January 1, 2014 Balance, June 30, 2014 Balance, January 1, 2014 Balance, June 30, 2014 Vessel acquisition Vessel acquisition Related Party Transactions [Abstract] Summary of Long Term Debt [Abstract] Debt Instrument [Axis] Prospero Maritime Inc. Borrower [Member] Bank loans Allendale Investments S.A. [Member] Eternity Shipping Company [Member] Pillory Associates Corporation [Member] Eirini Shipping Ltd. [Member] Xingang Shipping Ltd. / Alcinoe Shipping Ltd Borrower [Member] Manolis Shipping Ltd. Borrower [Member] Saf-Concord Shipping Ltd. Borrower [Member] Eleni Shipping Ltd. Borrower [Member] Pantelis Shipping Corp. Borrower [Member] Aggeliki Shipping Ltd. Borrower [Member] Noumea Shipping Ltd. Borrower [Member] Summary of Future Annual Loan Repayments for Long Term Debt [Abstract] 2015 2016 2017 2018 2019 Total Long-term Debt Commitments and Contingencies Disclosure [Abstract] Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Earnings Per Share [Abstract] Summary of Basic and Diluted Loss per Common Share [Abstract] Preferred Class B [Member] Weighted average common shares – Outstanding (in Shares) Disclosure Text Block Supplement [Abstract] Fair Value of Company’s Liabilities [Abstract] Derivatives, current and long-term portion Fair Value, Hierarchy [Axis] Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 3 [Member] Derivatives Not Designated as Hedging Instruments by Account Type [Abstract] Total derivative liabilities Gain or Loss on Derivatives Not Designated as Hedging Instruments [Abstract] Interest rate – Fair value Interest rate contracts - Realized loss Equity Method Investments and Joint Ventures [Abstract] Stockholders' Equity Note [Abstract] Business Description and Basis of Presentation [Text Block] Significant Accounting Policies [Text Block] Property, Plant and Equipment Disclosure [Text Block] Property, Plant and Equipment [Table Text Block] Related Party Transactions Disclosure [Text Block] Long-term Debt [Text Block] Schedule of Long-term Debt Instruments [Table Text Block] Schedule of Future Annual Loan Repayments [Table Text Block] Commitments and Contingencies Disclosure [Text Block] Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Earnings Per Share [Text Block] Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Financial Instruments Disclosure [Text Block] Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Derivative Instruments, Gain (Loss) [Table Text Block] Equity Method Investments and Joint Ventures Disclosure [Text Block] Investments and Other Noncurrent Assets [Text Block] Preferred Stock [Text Block] Stockholders' Equity Note Disclosure [Text Block] Legal Entity [Axis] Friends Investment Company Inc. [Member] Property, Plant and Equipment, Type [Axis] Containerships [Member] Scenario [Axis] Original Value [Member] Change in Accounting Estimate by Type [Axis] Service Life [Member] Related Party [Axis] Eurobulk Marine Holdings Inc. [Member] Nature of Expense [Axis] Vessel Management Fees (Member) Income Statement Location [Axis] Executive Services Expense [Member] Related Party Transaction [Axis] Vessel Sales [Member] Eurochart [Member] Charter Revenues [Member] Sentinel [Member] Technomar [Member] Range [Axis] Maximum [Member] Vessel Operating Expenses [Member] Euromar LLC Joint Venture (Member) Used for Valuation of Shares Awarded to Non-employees [Member] Award Type [Axis] Non-Vested [Member] General and Administrative Expense [Member] Antidilutive Securities [Axis] Unvested Incentive Award Shares [Member] Derivative, by Nature [Axis] Interest Rate Swap [Member] Carrying Value (Member) Payment-In-Kind Dividend Rate [Member] Minimum [Member] First Five Years [Member] Years Six and Seven [Member] After Year Seven [Member] Sale of Stock [Axis] Private Placement [Member] Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners Property, Plant and Equipment, Useful Life Impairment of Long-Lived Assets Held-for-use Depreciation, Depletion and Amortization Payments to Acquire Property, Plant, and Equipment Number of Vessels Pledged Assets Separately Reported, Other Assets Pledged as Collateral, at Fair Value Related Party Transaction Daily Fee (in Euro) Related Party Transaction, Amounts of Transaction Due to Related Parties Related Party Transaction Commission Percentage Related Party Transaction, Expenses from Transactions with Related Party Equity Method Investment, Ownership Percentage Related Party Transaction Amounts Of Transaction Per Crew Member Per Month Limited Dividends Percentage Loans to Profits Restricted Cash and Cash Equivalents Interest Expense, Debt Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Share Price Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Derivative, Number of Instruments Held Derivative, Notional Amount Long-term Debt, Fair Value Difference between Fair Value and Carrying Value Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures, Maximum Investment Escrow Deposit Preferred Stock, Dividend Rate, Percentage Dividend From Other Investments Receivable Preferred Stock, Additional Cash Dividend Under Specified Conditions, Percentage Preferred Stock, Cash Dividend Under Other Specified Conditions, Percentage Preferred Stock, Dividend Rate Under Other Specified Conditions, Percentage Preferred Stock, Convertible, Initial Conversion Price (in Dollars per share) Shares Issued, Price Per Share Proceeds from Issuance of Private Placement (in Dollars) Use of Estimates, Policy [Policy Text Block] New Accounting Pronouncements, Policy [Policy Text Block] Class of Stock [Domain] Assets Current assets Fixed assets Long-term assets Liabilities and shareholders’ equity Current liabilities Long-term liabilities Mezzanine equity Shareholders’ equity Revenues Operating expenses Other income/(expenses) Equity Component [Domain] Cash flows from operating activities: Adjustments to reconcile net loss to net cash provided by operating activities: Cash flows from investing activities: Cash flows from financing activities: Debt Instrument, Name [Domain] Schedule of Long-term Debt Instruments [Table] Debt Instrument [Line Items] Note 8 - Loss Per Share (Details) - Summary of Basic and Diluted Loss per Common Share [Table] Note 8 - Loss Per Share (Details) - Summary of Basic and Diluted Loss per Common Share [Line Items] Fair Value Hierarchy [Domain] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Liabilities Liabilities Entity [Domain] Note 1 - Basis of Presentation and General Information (Details) [Table] Note 1 - Basis of Presentation and General Information (Details) [Line Items] Property, Plant and Equipment, Type [Domain] Scenario, Unspecified [Domain] Change in Accounting Estimate, Type [Domain] Note 2 - Significant Accounting Policies (Details) [Table] Note 2 - Significant Accounting Policies (Details) [Line Items] Income Statement Location [Domain] Related Party [Domain] Related Party Transaction [Domain] Range [Domain] Interim Period, Costs Not Allocable [Domain] Note 4 - Related Party Transactions (Details) [Table] Note 4 - Related Party Transactions (Details) [Line Items] Equity Award [Domain] Note 7 - Stock Incentive Plan (Details) [Table] Note 7 - Stock Incentive Plan (Details) [Line Items] Antidilutive Securities, Name [Domain] Note 8 - Loss Per Share (Details) [Table] Note 8 - Loss Per Share (Details) [Line Items] Derivative, Name [Domain] Note 9 - Financial Instruments (Details) [Table] Note 9 - Financial Instruments (Details) [Line Items] Note 10 - Investment in Joint Venture (Details) [Table] Note 10 - Investment in Joint Venture (Details) [Line Items] Note 11 - Other Investments (Details) [Table] Note 11 - Other Investments (Details) [Line Items] Note 12 - Series B Preferred Shares (Details) [Table] Note 12 - Series B Preferred Shares (Details) [Line Items] Sale of Stock [Domain] Note 13 - Common Stock / Additional Paid In Capital (Details) [Table] Note 13 - Common Stock / Additional Paid In Capital (Details) [Line Items] Advances for vessel acquisition. Advances for vessel acquisition cash outflow. Difference between Fair Value and Carrying Value Balance sheet carrying amount of dividends from Other Investments declared but not received. Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures, Maximum Investment Limited Dividends Percentage Loans to Profits The number of vessels for which the carrying value is shown on the Company's balance sheet. The additional cash dividend, expressed as a percentage of the common stock dividend which would have been paid to Series B preferred shareholders on an as-converted basis, if a cash dividend is paid on the Company's common stock and if the dividend paid on the Series B Preferred Shares is 0%. However, this holds true only if the amount would exceed the normal 5% preferred dividend. The additional cash dividend, expressed as a percentage of the common stock dividend which would have been paid to Series B preferred shareholders on an as-converted basis, if a cash dividend is paid on the Company's common stock and if the dividend paid on the Series B Preferred Shares is 5% (in which case the 5% Series B preferred dividend will also be paid in cash). The initial conversion price at which each preferred share is convertible into common stock (subject to adjustment, including upon a default). The preferred stock dividend rate that will be used to determine the cash dividend that will be paid to Series B preferred shareholders under the following conditions: a cash dividend is paid on the Company's common stock and the dividend paid on the Series B Preferred Shares is 0%, and such amount exceeds 100% of the common stock dividend that would have been paid to the Series B preferred shareholders on an as-converted basis. Related Party Transaction Amounts Of Transaction Per Crew Member Per Month Related Party Transaction Commission Percentage Related Party Transaction Daily Fee Costs relating to the voyages performed by the vessels and may include port, canal, bunker expenses, commissions and other. Revenues arising from services provided to charterers according to the terms and conditions included in charter agreements. After Year Seven [Member] Represents information applicable when the stock has been outstanding for more than seven years. Aggeliki P [Member] Aggeliki Shipping Ltd Borrower [Member] Aggeliki Shipping Ltd. Borrower [Member] Allendale Investments SA [Member] Represents information pertaining to the Company's borrowings from Allendale Investments S.A. Artemis [Member] Carrying Value [Member] Carrying Value (Member) Charter Revenues [Member] Represents information pertaining to the Company's charter revenues. Containerships [Member] Represents information pertaining to the Company's containerships. Eirini Shipping Ltd [Member] Represents information pertaining to the Company's borrowings from Eirini Shipping Ltd. Eleni Shipping Ltd Borrower [Member] Eleni Shipping Ltd. Borrower [Member] Eternity Shipping Company [Member] Represents information pertaining to the Company's borrowings from Eternity Shipping Company. Eurobulk Marine Holdings Inc [Member] Eurochart [Member] Eurochart [Member] Euromar LLC Joint Venture [Member] Euromar LLC Joint Venture (Member) Executive Services Expense [Member] First Five Years [Member] Represents information applicable to the first five years during which the stock is outstanding. Friends Investment Company Inc [Member] Represents information pertaining to Friends Investment Company Inc. Inflation Adjusted [Member] Kuo Hsiung [Member] Manolis Shipping Ltd Borrower [Member] Manolis Shipping Ltd. Borrower [Member] Non Vested [Member] Noumea Shipping Ltd Borrower [Member] Noumea Shipping Ltd. Borrower [Member] Noumea Shipping Ltd [Member] Noumea Shipping Ltd [Member] Original Value [Member] Represents the original value, or the value prior to a change in estimate. Pantelis Shipping Corp Borrower [Member] Pantelis Shipping Corp. Borrower [Member] Payment In Kind Dividend Rate [Member] The payment-in-kind dividend rate to which the Company is entitled under a contribution agreement. Pillory Associates Corporation [Member] Represents information pertaining to the Company's borrowings from Pillory Associates Corporation. Prospero Maritime Inc Borrower [Member] Prospero Maritime Inc. Borrower [Member] Saf Concord Shipping Ltd Borrower [Member] Saf-Concord Shipping Ltd. Borrower [Member] Sentinel [Member] Sentinel [Member] Technomar [Member] Technomar [Member] The 2007 Plan [Member] Unvested Incentive Award Shares [Member] Used For Valuation Of Shares Awarded To Nonemployees [Member] Vessel Management Fees [Member] Vessel Management Fees (Member) Vessel Operating Expenses [Member] Vessel Sales [Member] Vessel Sales [Member] Xingang Shipping Ltd Alcinoe Shipping Ltd Borrower [Member] Xingang Shipping Ltd. / Alcinoe Shipping Ltd Borrower [Member] Years Six And Seven [Member] Represents information applicable to the sixth and seventh years during which the stock is outstanding. Document and Entity Information [Abstract] AdvancesForVesselAcquisitionCashOutflow CashFlowsFromInvestingActivitiesAbstract LongTermAssetsAbstract OtherIncomeExpensesAbstract CurrentAssetsAbstract AdjustmentsToReconcileNetLossToNetCashProvidedByOperatingActivitiesAbstract CashFlowsFromFinancingActivitiesAbstract LiabilitiesAndShareholdersEquityAbstract FixedAssetsAbstract LiabilitiesAbstract0 CashFlowsFromOperatingActivitiesAbstract MezzanineEquityAbstract CurrentLiabilitiesAbstract ShareholdersEquityAbstract LongTermLiabilitiesAbstract Cash and Cash Equivalents, Period Increase (Decrease) Operating Expenses [Abstract] Assets, Current Operating Expenses Unrealized Gain (Loss) on Derivatives Liabilities, Current Net Cash Provided by (Used in) Operating Activities Entity Common Stock, Shares Outstanding Liabilities [Abstract] Weighted Average Number of Shares Outstanding, Basic and Diluted Assets Entity Well-known Seasoned Issuer Gain (Loss) on Disposition of Property Plant Equipment Entity Registrant Name Entity Voluntary Filers Dividends Dividends, Preferred Stock Operating Income (Loss) Entity Filer Category Entity Public Float Document Fiscal Period Focus Current Fiscal Year End Date Increase (Decrease) in Restricted Cash Property, Plant and Equipment, Gross Liabilities Sales Commissions and Fees Amendment Flag Payments to Acquire Interest in Joint Venture Document Period End Date Assets, Noncurrent Restricted Cash and Cash Equivalents, Noncurrent Revenue, Net Net Cash Provided by (Used in) Investing Activities Payments of Dividends Repayments of Bank Debt Interest and Debt Expense Entity Central Index Key Net Cash Provided by (Used in) Financing Activities Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Assets [Abstract] Revenues [Abstract] Entity Current Reporting Status Nonoperating Income (Expense) Payments of Financing Costs Shares, Issued Document Fiscal Year Focus Liabilities and Equity Liabilities, Noncurrent Payments of Stock Issuance Costs Derivative Liability Preferred Stock Dividends, Income Statement Impact Amendment Description Document Type Stockholders' Equity Attributable to Parent Statement [Table] Statement [Line Items]