Award Date [Axis] Award Date [Domain] Award Type [Axis] Recent Accounting Pronouncements and Significant Accounting Policies [Abstract] Accounts payable, trade and other Accounts Payable, Current Accounts receivable, net of provision for credit losses (Note 4) Accounts receivable, net Receivable Type [Axis] Provision for Credit Losses [Abstract] Accounts, Notes, Loans and Financing Receivable [Line Items] Accrued liabilities Accrued Liabilities, Current Vessels' disposals Other comprehensive income /(loss) Accumulated Other Comprehensive Income (Loss), Net of Tax Other Comprehensive Income / (Loss) [Member] Ending balance Beginning balance Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Additional paid-in capital (Note 10) Additional Paid in Capital Additional Paid-in Capital [Member] Adjustments to reconcile net income/(loss) to net cash provided by / (used in) operating activities: Share-based compensation expense Allowance for estimated credit losses Provision for credit losses and write offs (Note 4) Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease) Provision for Credit Losses Demurrages write offs Accounts Receivable, Allowance for Credit Loss, Writeoff Amortization of dry-docking costs Amortization of Deferred Charges Amortization of deferred financing costs Amortization of deferred financing costs (Note 11) Antidilutive Securities [Axis] Earnings / (Loss) per Share [Abstract] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive securities excluded from computation of diluted loss per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Antidilutive Securities, Name [Domain] Impairment losses Impairment losses (Note 6) Total assets Assets ASSETS Assets [Abstract] Total non-current assets Assets, Noncurrent, Other than Noncurrent Investments and Property, Plant and Equipment Total major classes of current assets of discontinued operations Current assets from discontinued operations (Note 3) Disposal Group, Including Discontinued Operation, Assets, Current Total current assets Assets, Current CURRENT ASSETS: NON-CURRENT ASSETS: Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Evaluation of Purchase Transactions Business Combinations Policy [Policy Text Block] Unamortized dry-docking costs Deferred charges, net (Note 2) Capitalized Contract Cost, Net, Noncurrent Deferred voyage expenses (Note 2) Capitalized Contract Cost, Net, Current Net increase / (decrease) in cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Cash, cash equivalents and restricted cash at end of the year Cash, cash equivalents and restricted cash at beginning of the year Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Cash and Cash Equivalents [Axis] RECONCILIATION OF CASH, CASH EQUIVALENTS AND RESTRICTED CASH Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] Cash and cash equivalents at the end of the year Cash and Cash Equivalents, at Carrying Value, Including Discontinued Operations Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Restricted Cash Cash Equivalents [Member] Shares that can be purchased with warrants (in shares) Class of Treasury Stock [Table] Class of Stock [Line Items] Class of Stock [Domain] Exercise price of right (in dollars per share) Class of Warrant or Right, Exercise Price of Warrants or Rights Number of shares that can be purchased per right (in shares) Class of Warrant or Right, Number of Securities Called by Each Warrant or Right Preferred Stock [Abstract] Share Repurchase Program [Abstract] Class of Stock Disclosures [Abstract] Commitments and Contingencies [Abstract] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Commitments and contingencies (Note 9) Commitments and Contingencies Dividends per share (in dollars per share) Common Stock, Dividends, Per Share, Cash Paid Tender Offer to Exchange Common Shares for Shares of Preferred Stock [Abstract] At The Market Offering [Abstract] Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] Common Stock [Member] Common stock, shares issued (in shares) Common Stock, Shares, Issued Common stock, par value (in dollars per share) Common shares, par value (in dollars per share) Common stock, $0.01 par value; 500,000,000 shares authorized; 5,082,726 issued and outstanding as at December 31, 2021 and 2020, respectively (Note 10) Common stock, shares authorized (in shares) Common Stock, Shares Authorized Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Other Comprehensive Income / (Loss) Comprehensive income / (loss) from continuing and discontinued operations Comprehensive Income (Loss), Net of Tax, Attributable to Parent Concentration Risk [Table] Maximum loss if charterers failed to perform Concentration Risk, Credit Risk, Financial Instrument, Maximum Exposure Concentration Risk Type [Domain] Concentration risk percentage Concentration Risk, Percentage Concentration Risk Benchmark [Domain] Concentration Risk Type [Axis] Concentration Risk [Line Items] Concentration Risk By Benchmark [Axis] Concentration of Credit Risk Principles of Consolidation Container Vessels [Member] Container Vessels [Member] Contract assets Contract with Customer, Asset, after Allowance for Credit Loss, Current Conversion of Series B preferred stock to common stock (Note 10) (in shares) Conversion of Series B preferred stock to common stock (in shares) Conversion of Stock, Shares Converted Number of shares issued upon conversion (in shares) Convertible Preferred Stock, Shares Issued upon Conversion EXPENSES: Customer Concentration Risk [Member] Customer Concentration Risk [Member] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Table] Revenues and Accounts Receivable [Abstract] Disaggregation of Revenue [Abstract] Fixed margin rate Debt Instrument, Basis Spread on Variable Rate Term Net book value of tanker vessels used as collateral Debt Instrument, Collateral Amount Long-Term Debt [Abstract] Debt Instrument [Axis] Long-term debt Total Long-term Debt, Gross Schedule of Long-term Debt Instruments [Table] Reduction in principal amount of loan Debt Instrument, Decrease, Forgiveness Debt Instrument [Line Items] Commitment fees and other Commitment fees Financing Costs and Liabilities Long-Term Debt [Abstract] Debt Instruments [Abstract] Interest rate Debt Instrument, Interest Rate, Stated Percentage Amount available for drawdown Debt Instrument, Unused Borrowing Capacity, Amount Debt Instrument, Name [Domain] Dry-Docking Costs Dry-Docking Costs [Abstract] Deferred Costs [Abstract] Less non-current portion of unamortized deferred finance costs Debt Issuance Costs, Noncurrent, Net Less current portion of unamortized deferred finance costs Debt Issuance Costs, Current, Net Less unamortized deferred financing costs Debt Issuance Costs, Net Actuarial gain / (loss) Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) Depreciation Depreciation Vessel Depreciation [Abstract] Depreciation and amortization of deferred charges Depreciation and Amortization, Discontinued Operations Depreciation and amortization of deferred charges (Notes 3 and 6) Depreciation, Depletion and Amortization Depreciation and amortization of deferred charges (Notes 2, 6 and 7) Depreciation, Depletion and Amortization, Nonproduction Vessel Depreciation Earnings per common share, basic, discontinued operations (Note 12) (in dollars per share) Earnings per common share, discontinued operations (in dollars per share) Earnings per common share, diluted, discontinued operations (Note 12) (in dollars per share) Earnings per common share, discontinued operations (in dollars per share) Discontinued Operations [Abstract] Gain / (loss) on vessels' sale Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax Discontinued Operations Discontinued Operations, Policy [Policy Text Block] Accrued liabilities Disposal Group, Including Discontinued Operation, Accrued Liabilities, Current Disposal Group Classification [Axis] Accounts payable, trade and other Disposal Group, Including Discontinued Operation, Accounts Payable, Current Other Income Disposal Group, Including Discontinued Operation, Other Income Disposal Group Classification [Domain] Prepaid expenses and other assets Disposal Group, Including Discontinued Operation, Prepaid and Other Assets, Current Time-charter revenues Disposal Group, Including Discontinued Operation, Revenue Cash and cash equivalents Accounts receivable, trade Foreign currency gains / (losses) Vessels' operating expenses Disposal Group, Including Discontinued Operation, Operating Expense Discontinued Operations Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Disposal Group Name [Domain] Items Constituting Net Income / (Loss) from Discontinued Operations [Abstract] Dividends declared and paid (at $0.10 per share) (Note 12) Dividends paid Due from related parties, current Due from Other Related Parties, Current Due to related parties (Note 5) Due to related parties Earnings / (Loss) per Share Earnings/(Loss) per Share [Abstract] Earnings Per Share, Basic and Diluted [Abstract] Earnings/(Loss) per Common Share Earnings / (Loss) per common share, basic, total (Note 12) (in dollars per share) Earnings / (Loss) per common share, total (in dollars per share) Earnings / (Loss) per Share [Abstract] Earnings / (Loss) per common share, diluted, total (Note 12) (in dollars per share) Earnings / (Loss) per common share, total (in dollars per share) Weighted-average period to recognize compensation cost of non-vested awards Stock Options [Member] Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] Unrecognized compensation cost Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Equity Component [Domain] Equity, Class of Treasury Stock [Line Items] Fair Value Measurements Fair Value Hierarchy and NAV [Axis] Financial Instruments and Fair Value Disclosures [Abstract] Measurement Frequency [Axis] Fair Value Hierarchy and NAV [Domain] Non-Recurring Basis [Member] Fair Value, Nonrecurring [Member] Measurement Frequency [Domain] Level 2 [Member] Level 3 [Member] Financial Instruments and Fair Value Disclosures Financial Instruments Disclosure [Text Block] Foreign Currency Translation Exchange rate Foreign Currency Exchange Rate, Translation Grantee Status [Domain] Grantee Status [Axis] Loss / (gain) on vessels' sale Gain / (loss) on vessel's sale Loss / (Gain) on vessel's sale (Note 6) General and administrative expenses (Notes 5 and 10) General and Administrative Expenses [Member] General and Administrative Expense [Member] Impairment of assets held for sale Impairment charge Impairment of Long-Lived Assets [Abstract] Impairment, Long-Lived Asset, Held-for-Use [Abstract] Impairment of Long-Lived Assets and Assets Held for Sale Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Impairment for assets held for use Impairment charges Income Statement Location [Domain] Income Taxes [Abstract] Income Statement Location [Axis] Earnings / (Loss) per common share, diluted, continuing operations (Note 12) (in dollars per share) Earnings / (Loss) per common share, continuing operations (in dollars per share) Net income/ (loss) from discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Earnings / (Loss) per common share, basic, continuing operations (Note 12) (in dollars per share) Earnings / (Loss) per common share, continuing operations (in dollars per share) Net income / (loss) from continuing operations Net income / (loss) from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Disposal Groups, Including Discontinued Operations [Table] Consolidated Statements of Operations [Abstract] Disposal Group Name [Axis] Income Taxes Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Net income / (loss) from discontinued operations (Note 3) Deferred voyage expenses Increase (Decrease) in Contract with Customer, Asset Lease liabilities under operating leases Increase (Decrease) in Operating Lease Liability Other non-current assets Increase (Decrease) in Other Noncurrent Assets Other liabilities, non current Increase (Decrease) in Other Noncurrent Liabilities Accounts receivable Increase (Decrease) in Accounts Receivable Accounts payable, trade and other Increase (Decrease) in Accounts Payable Accrued liabilities Increase (Decrease) in Accrued Liabilities Deferred liabilities Due to related parties Increase (Decrease) in Due to Related Parties Increase / (Decrease) in: Increase (Decrease) in Operating Liabilities [Abstract] Inventories Increase (Decrease) in Inventories (Increase) / Decrease in: Increase (Decrease) in Operating Assets [Abstract] Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Increase (Decrease) in Stockholders' Equity [Roll Forward] Effect of dilutive shares (in shares) Incremental Common Shares Attributable to Dilutive Effect of Conversion of Preferred Stock Accrued interest Interest and Finance Costs [Abstract] Interest Expense [Abstract] Interest Expense [Abstract] Interest and finance costs (Note 11) Total Interest Expense Interest expense on bank debt (Note 8) Interest expense on long-term debt Interest payments, net of amounts capitalized Inventories Inventory, Policy [Policy Text Block] Inventories Inventory, Net Interest income LIBOR [Member] Revenues Related to Time Charters and Pool Arrangements Lessor, Leases [Policy Text Block] Rent Concessions Related to the COVID-19 Pandemic Lessee, Leases [Policy Text Block] Year 1 Total Lessee, Operating Lease, Liability, to be Paid Less imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Term of leases Lessee, Operating Lease, Term of Contract Office Rental Obligations Lessee, Operating Lease, Liability, Maturity [Table Text Block] Year 2 Lessee, Lease, Description [Table] Lessee, Lease, Description [Line Items] Office Leases [Abstract] Lessee, Operating Lease, Description [Abstract] LIABILITIES AND STOCKHOLDERS' EQUITY Carrying Amounts of Major Classes of Liabilities of Discontinued Operations [Abstract] Total liabilities and stockholders' equity Liabilities and Equity Total major classes of current liabilities of discontinued operations Current liabilities from discontinued operations (Note 3) Disposal Group, Including Discontinued Operation, Liabilities, Current LONG-TERM LIABILITIES: Total long-term liabilities Liabilities, Noncurrent Total current liabilities Liabilities, Current CURRENT LIABILITIES: Commitment fee percentage Line of credit facility Weighted average interest rate Long-term Debt, Weighted Average Interest Rate, over Time Total debt, net of deferred financing costs Long-term Debt Long-Term Debt [Text Block] Principal Repayments [Abstract] Year 1 Long-Term Debt, Maturity, Year One Current [Abstract] Long-term Debt, Current Maturities [Abstract] Non-current [Abstract] Long-term Debt, Excluding Current Maturities [Abstract] Year 2 Long-Term Debt, Maturity, Year Two Year 3 Long-Term Debt, Maturity, Year Three Repairs and Maintenance Accumulated Depreciation [Abstract] Property and Equipment [Abstract] Vessels' Cost [Abstract] Net income from discontinued operations Net Income (Loss) from Discontinued Operations Available to Common Shareholders, Basic Diluted Earnings / (Loss) per Share [Abstract] Net Income (Loss) Available to Common Stockholders, Operations, Diluted [Abstract] Basic Earnings / (Loss) per Share [Abstract] Net Income (Loss) Available to Common Stockholders, Operations, Basic [Abstract] Net income/(loss) available to common stockholders from continuing operations Net Income (Loss) from Continuing Operations Available to Common Shareholders, Basic Net income / (loss) available to common stockholders from continuing operations Net Income (Loss) from Continuing Operations Available to Common Shareholders, Diluted Net income from discontinued operations Net Income (Loss) from Discontinued Operations Available to Common Shareholders, Diluted Net Cash provided by / (used in) Financing Activities Net Cash Provided by (Used in) Financing Activities Cash Flows provided by / (used in) Financing Activities: Net Cash provided by / (used in) Operating Activities Net Cash Provided by (Used in) Operating Activities Cash Flows used in Investing Activities: Cash Flows provided by / (used in) Operating Activities: Net Cash used in Investing Activities Net Cash Provided by (Used in) Investing Activities Net income / (loss) from continuing and discontinued operations Net (loss) income Net income /(loss) Total net income / (loss) available to common stockholders Net Income (Loss) Available to Common Stockholders, Diluted Total net income / (loss) available to common stockholders Net Income (Loss) Available to Common Stockholders, Basic Recent Accounting Pronouncements Not Yet Adopted New Accounting Pronouncements, Policy [Policy Text Block] Total other income / (expenses), net Nonoperating Gains (Losses) Number of reportable segments Number of Reportable Segments Lease liabilities, current (Note 9) Lease liabilities, current Long-term lease liabilities (Note 9) Lease liabilities, non- current Office Rental Obligations [Abstract] Lessee, Operating Lease, Liability, Payment, Due [Abstract] Right of use asset under operating leases (Note 9) Operating right-of-use asset Impairment charge Operating Lease, Impairment Loss Rent expense Operating Lease, Cost Present value of lease liabilities Operating lease liability Operating Lease, Liability Revenues Operating Lease, Lease Income Vessel operating expenses Operating income / (loss) Operating Income (Loss) General Information General Information [Abstract] Other comprehensive income / (loss) (Actuarial gain / (loss)) Actuarial (loss) gain Impairment of unamortized dry-dock costs Impairment charge Other Asset Impairment Charges OTHER INCOME / (EXPENSES) Other non-current assets (Note 6) Other non-current assets Depreciation Other Depreciation and Amortization Other liabilities, non-current Other Liabilities, Noncurrent Income allocated to participating securities (Note 12) Income allocated to participating securities Participating Securities, Distributed and Undistributed Earnings (Loss), Basic Income allocated to participating securities Participating Securities, Distributed and Undistributed Earnings (Loss), Diluted Payments of equity issuance and financing costs (Note 8) Payment of Financing and Stock Issuance Costs Payments for vessels' improvements (Note 6) Payments for vessels' improvements Common shares re-purchase and retirement, including expenses (Note 10) Payments for Repurchase of Common Stock Payment for repurchase of preferred stock Repurchase of Series B preferred shares (Note 10) Repurchase of Series B preferred shares Cash dividends (Note 12) Payments of Ordinary Dividends, Common Stock Property and equipment additions (Note 7) Payments to Acquire Machinery and Equipment Payment for vessels acquisition Plan Name [Domain] Plan Name [Axis] Dividend rate percentage Preferred stock, fixed liquidation preference per share (in dollars per share) Preferred Stock [Member] Gain from repurchase of preferred shares (Notes 5 and 12) Gain from repurchase of preferred shares Preferred stock, additional cash consideration (in dollars per share) Preferred stock, $0.01 par value; 25,000,000 shares authorized, none issued and outstanding as at December 31, 2021 and 2020, respectively (Note 10) Preferred Stock, Value, Issued Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Preferred stock, redemption price per share (in dollars per share) Preferred stock, shares outstanding (in shares) Preferred stock, shares outstanding (in shares) Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Prepaid expenses and other assets Prepaid Expense and Other Assets, Current Private Placement Offering [Member] Insurance settlements Issuance of preferred stock, net of expenses (Note 10) Proceeds from loan agreement Proceeds from long-term bank debt (Note 8) Net proceeds from issuance of common stock Proceeds from sale of property, net of expenses (Note 7) Proceeds from Sale of Land Held-for-use Amount drawn under credit facility Property, Plant and Equipment [Line Items] Property and Equipment, net Property, Plant and Equipment Disclosure [Text Block] Vessels' Impairment [Abstract] Property, Plant and Equipment Impairment or Disposal [Abstract] Estimated useful life Additions in equipment Acquisitions, other vessels' costs and improvement Purchase price of the vessels Property and Equipment, net [Abstract] Property and Equipment, net Property, Plant and Equipment [Table Text Block] Long-Lived Tangible Asset [Axis] Long-Lived Tangible Asset [Domain] Land sale Vessels' disposals Property, Plant and Equipment, Disposals Fair value of impaired vessels Total fixed assets Property, Plant and Equipment, Net Transfer from advances for vessel acquisitions and other vessel costs Property, Plant and Equipment, Transfers and Changes Vessel Cost Beginning balance Ending balance Property, Plant and Equipment, Gross FIXED ASSETS: Net Book Value [Abstract] Change in provision of estimated losses Accounts Receivable, Credit Loss Expense (Reversal) Receivable [Domain] Revenue, Accounts Receivable and Provision for Credit Losses [Abstract] Transactions with Related Parties [Abstract] Related Party Transaction [Line Items] Transaction with Related Parties [Abstract] Related party expenses Related Party Transaction, Expenses from Transactions with Related Party Related Party Transaction [Axis] Related Party [Axis] Transactions with Related Parties Related Party Transaction [Domain] Related Party [Domain] Repayments of long-term bank debt (Note 8) Repayments of Secured Debt Cash and Cash Equivalents [Domain] Restricted cash at the end of the year Restricted Stock [Member] Restricted Shares [Member] Accumulated Deficit [Member] Accumulated deficit Retained Earnings (Accumulated Deficit) Revenues Related to Voyage Charters Revenue from Contract with Customer [Policy Text Block] Revenues Revenue from Contract with Customer, Excluding Assessed Tax Revenue, Accounts Receivable and Provision for Credit Losses Revenue from Contract with Customer [Text Block] Revenues [Abstract] Revenue Recognition [Abstract] REVENUE: Revenues [Abstract] Revenue (Notes 2 and 4) Revenues Expected life Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Term Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Vesting percentage Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Sale of Stock [Domain] Revenues [Member] Maturities of Debt Facilities Schedule of Maturities of Long-term Debt [Table Text Block] Movement of Restricted Stock Cost Revenue from Charterers Earnings Per Share, Basic and Diluted Long-term Debt Schedule of Debt [Table Text Block] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Discontinued Operations Disposal Groups, Including Discontinued Operations [Table Text Block] Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table] Schedule of Related Party Transactions, by Related Party [Table] Property, Plant and Equipment [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Stock by Class [Table] Current portion of long-term debt, net of unamortized deferred fin. costs (Note 8) Current portion of long-term debt, net of deferred finance costs Secured Debt, Current Long-term debt, net of unamortized deferred financing costs (Note 8) Non-current portion of long-term debt, net of deferred finance costs Secured Long-term Debt, Noncurrent Segmental Reporting [Abstract] Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract] Segmental Reporting Segment Reporting, Policy [Policy Text Block] Continuing Operations [Member] Operating Activities [Domain] Discontinued Operations [Member] Series A Preferred Shares [Member] Series A Preferred Stock [Member] Series B Preferred Shares [Member] Series B Preferred Stock [Member] Series B Convertible Preferred Stock [Member] Series C Preferred Stock [Member] Vesting period Stock options granted (in shares) Weighted Average Grant Date Price [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Vested Ratably Over Two Years from Issuance Date [Member] Vested on Issuance Date [Member] Market value of common stock (in dollars per share) Share Price Vested Ratably Over Three Years from Issuance Date [Member] Compensation cost on restricted stock and stock option awards (Note 10) Forfeited or expired (in dollars per share) Share Repurchase Program [Domain] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share Repurchase Program [Axis] Share-based Payment Arrangement, Employee [Member] Exercise price (in dollars per share) Dividend yield Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Outstanding at beginning of period (in dollars per share) Outstanding at end of period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Forfeited or expired (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Number of Shares [Roll Forward] Vested (in dollars per share) Granted (in dollars per share) Outstanding at end of period (in shares) Outstanding at beginning of period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Fair Value Assumptions for Valuing Stock Options Granted [Abstract] Granted (in shares) Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Risk free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Number of shares issuable (in shares) Number of shares reserved for issuance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Weighted average expected volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Award Type [Domain] Exercise Price Range [Axis] Exercise Price Range [Domain] Share-Based Payment Stock Option Awards [Abstract] Restricted Common Stock [Abstract] Balance (in shares) Balance (in shares) Shares, Outstanding Recent Accounting Pronouncements and Significant Accounting Policies Consolidated Balance Sheet [Abstract] Consolidated Statements of Comprehensive Income / (Loss) [Abstract] Class of Stock [Axis] Statement [Table] Operating Activities [Axis] Statement [Line Items] Consolidated Statements of Cash Flows (continuing and discontinued operations) [Abstract] Equity Components [Axis] Consolidated Statements of Stockholders' Equity [Abstract] Stock options exercised (in shares) Conversion of Series B preferred stock to common stock (Note 10) (in shares) Conversion of Series B preferred stock to common stock (in shares) Stock Issued During Period, Shares, Conversion of Convertible Securities Shares issued (in shares) Issuance of Series B preferred stock, net of expenses (Note 10) (in shares) Number of shares sold during period (in shares) Compensation cost on restricted stock and stock option awards (Note 10) (in shares) Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture Issuance of common stock in exchange for entities' acquisition (Note 10) (in shares) Issuance of restricted stock and compensation cost on restricted stock (Note 10) (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Authorized share repurchase amount Stock Option Awards [Abstract] Compensation Cost on Restricted Common Stock [Abstract] Shares Granted or Issued, Share-based Payment Arrangement [Abstract] Fractional shares issued (in shares) Common shares re-purchase and retirement, including expenses (Note 10) Number of shares repurchased and cancelled Stock Repurchased and Retired During Period, Value Issuance of restricted stock and compensation cost on restricted stock (Note 10) Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Common shares re-purchase and retirement, including expenses (Note 10) (in shares) Number of shares repurchased and cancelled (in shares) Stock Repurchased and Retired During Period, Shares Issuance of Series B preferred stock, net of expenses (Note 10) Issuance of Series B preferred stock, net of expenses Compensation cost on restricted stock and stock option awards (Note 10) Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture Issuance of common stock in exchange for entities' acquisition (Note 10) Conversion of Series B preferred stock to common stock (Note 10) Stock Issued During Period, Value, Conversion of Convertible Securities Reverse stock split ratio Reverse stock split ratio Total stockholders' equity Balance Balance Stockholders' Equity Attributable to Parent Changes in Capital Accounts Re-purchase and Retirement of Company's Shares Stockholders' Equity, Policy [Policy Text Block] STOCKHOLDERS' EQUITY: Changes in Capital Accounts [Abstract] Subsequent Event [Member] Subsequent Event Type [Domain] Subsequent Event [Line Items] Subsequent Event Type [Axis] Subsequent Events [Abstract] Subsequent Event [Table] Subsequent Events Subsequent Events [Text Block] Sale of Stock [Axis] SUPPLEMENTAL CASH FLOW INFORMATION Assets Held for Sale [Abstract] Accounts Receivable, net Freight and Demurrage Receivables [Member] Trade Accounts Receivable [Member] Use of Estimates Vesting [Axis] Vesting [Domain] Variable Rate [Axis] Variable Rate [Domain] Shareholders Rights Agreement [Abstract] Weighted average number of common shares, diluted (Note 12) (in shares) Total shares outstanding (in shares) Weighted average number of common shares, basic (Note 12) (in shares) Weighted average number of common shares outstanding (in shares) Mrs. Aliki Paliou [Member] Board of Directors Chairman [Member] Mr. Andreas Michalopoulos [Member] Chief Executive Officer [Member] Chief Financial Officer [Member] Directors [Member] Director [Member] Customers [Axis] Maximum [Member] Minimum [Member] Customer [Domain] Product and Service [Domain] Product and Service [Axis] Statistical Measurement [Domain] Statistical Measurement [Axis] Title of Individual [Domain] Title of Individual [Axis] Cover [Abstract] Document Type Document Annual Report Document Transition Report Document Shell Company Report Entity Interactive Data Current Document Registration Statement Document Accounting Standard Amendment Flag ICFR Auditor Attestation Flag Document Fiscal Year Focus Document Fiscal Period Focus Document Period End Date Entity Registrant Name Entity Central Index Key Entity File Number Entity Incorporation, State or Country Code Current Fiscal Year End Date Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Shell Company Entity Filer Category Entity Emerging Growth Company Entity Addresses [Table] Entity Addresses, Address Type [Axis] Address Type [Domain] Business Contact [Member] Entity Addresses [Line Items] Contact Personnel Name Contact Personnel Email Address Contact Personnel Fax Number Entity Address, Address Line One Entity Address, Address Line Two Entity Address, City or Town Entity Address, Country Entity Address, Postal Zip Code Country Region City Area Code Local Phone Number Title of 12(b) Security Trading Symbol Security Exchange Name Entity Common Stock, Shares Outstanding Auditor Name Auditor Location Auditor Firm ID Number of votes per share each holder of record of shares is entitled. Preferred Stock, Number of Votes per Share Number of votes per share Number of preferred shares that have been repurchased and cancelled during the period. Preferred Stock Repurchased and Cancelled During Period, Shares Repurchase and cancellation of preferred stock (in shares) Repurchase and cancellation of preferred stock (in shares) A global provider of shipping transportation services., founded by the Company's Chairman of the Board, Mr. Symeon Palios. The Company's Chief Executive Officer, Director and Secretary, Mr. Andreas Michalopoulos, also served as Chief Financial Officer and Treasurer of Diana Shipping Inc. through February 2020. Diana Shipping Inc. [Member] Diana Shipping Inc. [Member] The threshold voting power percentage of any holder of Preferred Stock, together with its affiliates, for all matters submitted to a vote of the stockholders of the Company. Preferred Stock, Threshold Voting Power, Percentage Voting power percentage threshold Amount of gain (loss) from sale of property. Gain (Loss) from Sale of Property Gain from property sale (Note 7) Gain from property sale Gain from property sale (Note 7) Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement. Foreign Currency Transaction Operating Gain (Loss), before Tax Foreign currency losses / (gains) Voyage Expenses consisting of port, canal and bunker expenses and commission costs that are incurred on time-charter and voyage-charter arrangements. Commissions are paid directly to brokers by the company. Voyage Expenses Voyage expenses Fees paid to third parties for providing technical and commercial services to the entity's vessels. Management Fees Management fees (Note 1) Cost of vessels, including contract price and any material expenses incurred upon acquisition (initial repairs, improvements and delivery expenses, interest and on-site supervision costs incurred during the construction periods), less accumulated depreciation. Vessels, net Vessels, net (Note 6) Beginning balance Ending balance The net amount after accumulated depreciation, depletion and amortization of property and equipment. Property and equipment, net Property and equipment, net (Note 7) Beginning balance Ending balance The entire disclosure of interest and finance related expenses associated with nonoperating financing activities of the entity. Interest and Finance Costs [Text Block] Interest and Finance Costs Subsequent Event [Abstract] Subsequent Event [Abstract] The number of members on the Company's board of directors. Number of members on Board of Directors Number of members on board of directors Number of shares of common stock tendered for exchange to Series B Preferred Shares under the Company's Tender Offer. Common Stock, Shares Tendered, Shares Common Stock, number of shares tendered for exchange (in shares) An administrative charge made by the lender for arranging a line of credit facility to cover administration and managements costs. Line of Credit Facility, Arrangement Fee Arrangement fees On March 2, 2022, the Company entered into an unsecured credit facility with Mango Shipping Corp. Unsecured Credit Facility [Member] Unsecured Credit Facility [Member] Persons serving on board of directors that resigned. Resigned Board Members [Member] Resigned Board Members [Member] Taxes and expenses relating to the sale of land or properties. Sale of Property, Taxes and Expenses Taxes and expenses on property sale The gross proceeds from the sale of land held for use; excludes sales of land held as inventory or investments. Gross Proceeds from Sale of Land Held-for-use Proceeds from sale of land Amount due for proceeds from insurance claims. Insurance Claims Receivable [Member] Insurance Claims [Member] The number of vessels acquired by the entity. Number of Vessels Acquired Number of tanker vessels acquired Disposal Group, Including Discontinued Operation, Assets [Abstract] Carrying Amounts of Major Classes of Assets of Discontinued Operations [Abstract] Amount of write-down of assets, attributable to disposal group, including, but not limited to, discontinued operation. Disposal Group, Including Discontinued Operation, Impairment Loss Impairment losses Costs relating to the voyages performed by the vessels and may include port, canal, bunker expenses, commissions and other from discontinued operations. Disposal Group, Including Discontinued Operation, Voyage Expenses Voyage expenses Operations of container vessels (containers segment). Container Segment [Member] Container Segment [Member] Professional and contract service expense includes cost reimbursements for support services related to contracted projects, outsourced management, technical and staff support from discontinued operations. Disposal Group, Including Discontinued Operation, Management Fees Management fees A time charter is a contract to charter a vessel for a fixed period at a set daily rate. Time Charters [Member] Time Charters [Member] A spot charter is a contract to carry specific cargo from a load port to a discharge port at a per-day rate or a per-ton carry amount, depending on the agreement. Spot Charters [Member] Spot Charters [Member] Under a pool arrangement, the Company enters into a time charter contract with a pool manager according to which it collects on a monthly basis hire proceeds over the term of the charter. The monthly proceeds are variable and are calculated according to the terms of the pool participation agreement. Pool Charters [Member] Pool Charters [Member] Charterer of tanker vessels with whom the Company does business. Charterer G [Member] Charterer of tanker vessels with whom the Company does business. Charterer D [Member] Charterer D [Member] Charterer of tanker vessels with whom the Company does business. Charterer E [Member] Charterer E [Member] Charterer of tanker vessels with whom the Company does business. Charterer B [Member] Charterer B [Member] Charterer of tanker vessels with whom the Company does business. Charterer A [Member] Charterer A [Member] Charterer of tanker vessels with whom the Company does business. Charterer F [Member] Charterer F [Member] Charterer of tanker vessels with whom the Company does business. Charterer C [Member] Charterer C [Member] Vessels, net [Abstract] The entire disclosure for vessels used in providing global shipping services. Vessels, Net Disclosure [Text Block] Vessels, net Pamina is a container vessel built in 2005 with a TEU, Twenty-foot Equivalent Unit, of 5,042. Rotterdam is a container vessel built in 2008 with a TEU, Twenty-foot Equivalent Unit, of 6,494. Pamina and Rotterdam [Member] Pamina and Rotterdam [Member] The total number of vessels impaired. Number of Vessels Impaired Number of vessels impaired Pucon is a container vessel built in 2006 with a TEU, Twenty-foot Equivalent Unit, of 6,541. Pamina is a container vessel built in 2005 with a TEU, Twenty-foot Equivalent Unit, of 5,042. Rotterdam is a container vessel built in 2008 with a TEU, Twenty-foot Equivalent Unit, of 6,494. Pucon, Pamina and Rotterdam [Member] Pucon, Pamina and Rotterdam [Member] Container vessel built in 2006 with a TEU, Twenty-foot Equivalent Unit, of 6,541. Pucon [Member] Pucon [Member] Container vessel built in 2008 with a TEU, Twenty-foot Equivalent Unit, of 6,494. Rotterdam [Member] Rotterdam [Member] Vessels' Disposals [Abstract] Vessels' Disposals [Abstract] Amount after accumulated depreciation, depletion and amortization, of divestiture of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment Property, Plant and Equipment Disposals, Net Vessels' disposals Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets, goodwill and unamortized dry-docking costs. Asset Impairment Charges Including Unamortized Drydocking Costs Impairment charges Name of the vessel. Domingo Container Vessel [Member] Domingo Container Vessel [Member] Watercraft used as a means of transportation on water. Vessels [Member] Vessels [Member] Tanker Vessels [Member] Sales price of long-lived, physical asset used in the normal conduct of business. Property Plant And Equipment Sales Price Sale price of vessels Number of subsidiaries having by the entity. Number of Subsidiaries Number of subsidiaries Vessel Acquisitions [Abstract] Vessel Acquisitions [Abstract] Briolette is a tanker vessel with a DWT of 104,588 that was built in 2011. P.Fos is a tanker vessel with a DWT of 115,577 that was built in 2007 and acquired in January 2020. Briolette and P. Fos [Member] Briolette and P. Fos [Member] Tanker vessel with a DWT of 1104,623 that was built in 2011 and acquired in August 2019. Blue Moon [Member] Blue Moon [Member] Name of the acquired entity. Rongelap Shipping Company Inc [Member] Rongelap Shipping Company Inc [Member] Vessels acquired during 2020. P. Fos, P. Kikuma and P. Yanbu [Member] P. Fos, P. Kikuma and P. Yanbu [Member] Tanker vessel with a DWT of 115,915 that was built in 2007 and acquired in March 2020. P. Kikuma [Member] P. Kikuma [Member] Tanker vessel with a DWT of 105,391 that was built in 2011 and acquired in December 2020. P. Yanbu [Member] P. Yanbu [Member] Tanker vessel with a DWT of 115,577 that was built in 2007 and acquired in January 2020. P. Fos [Member] P. Fos [Member] Total other costs capitalized in vessel cost consisting of predelivery expenses. Costs Capitalized in Vessels Pre-delivery costs capitalized The percentage of the value of the Company's common stock that is owned, directly or indirectly, by "qualified shareholders". Minimum Stock Ownership Percentage for Tax Exemption Minimum stock ownership percentage for tax exemption Tax rate applied by the tax authorities on U.S. source shipping income. Federal Tax Rate on U.S.-Source Shipping Income Federal tax rate on U.S. source shipping income Percentage of gross income derived from voyages that begin or end in the United States. Percentage of Gross Income Subject to Tax Percentage of gross income subject to tax Equity impact of the value of preferred stock that has been repurchased and cancelled, including expenses, during the period. Preferred Stock Repurchased and Cancelled During Period, including Expenses, Value Repurchase and cancellation of Series C preferred stock, including expenses (Note 10) Equity impact of the value of preferred stock that has been repurchased and cancelled during the period. Preferred Stock Repurchased and Cancelled During Period, Value Repurchase and cancellation of Series B preferred stock (Note 10) Watercraft used as a means of transportation on water. Tanker Vessels [Member] Tanker Vessels [Member] The rate used to estimate utilization of a vessel during the year for the calculation of cash flows for impairment purposes. Percentage of Assumed Vessel Utilization Effective fleet utilization percentage Period that average historical rates available for each type of vessel, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Average Historical Rates Available for Each Type of Vessel, Term Term of average historical rates available for each type of vessel The estimated residual scrap rate per light-weight ton for the tanker and container vessels in the fleet. Estimated Residual Scrap Rate Per Lightweight Ton for Tanker and Container Vessels Estimated residual scrap rate per light-weight ton Number of tanker vessels managed by an unaffiliated entity. Number of Vessels Managed by Unaffiliated Entity Number of tanker vessels managed by Maersk Tankers Disclosure of accounting policy for voyage expenses. Voyage Expenses, Policy [Policy Text Block] Voyage Expenses Disclosure of accounting policy for the entity's ability to continue as a going concern. Going Concern [Policy Text Block] Going Concern Transfer of disposal group asset is expected to qualify for recognition as a completed sale period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Transfer of Disposal Group Asset is Expected to Qualify for Recognition, Completion of Sale Period Transfer of disposal group asset is expected to qualify for recognition period Period of non-disclosed value of unsatisfied performance obligations for contracts with an original expected length, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Period of Non-disclosed Value of Unsatisfied Performance Obligations for Contracts Period of non-disclosed value of unsatisfied performance obligations for contracts Value of non-cash investing activities in the period. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. Non-cash Investing Activities Non-cash investing activities The cash outflow for advances for the acquisition of vessels and other vessel costs. Payments for Advances for Vessel Acquisitions and Other Vessel Costs Advances for vessel acquisitions and other vessel costs The cash inflow from the sale of vessels, net of expenses. Proceeds from Sale of Vessels Proceeds from sale of vessels, net of expenses (Note 6) The cash outflow for the acquisition of vessels and other vessel costs. Payments for Vessel Acquisitions and Other Vessel Costs Vessel acquisitions and other vessels' costs (Note 6) Reclassification of compensation cost of issued stock including a provision that prohibits sale or substantive sale of an equity instrument for a specified period of time or until specified performance conditions are met to stockholders' equity. Reclassification of Compensation Cost of Issued Restricted Stock Awards Reclassification of compensation cost of issued restricted stock awards from other liabilities to stockholders' equity The value of shares issued as [noncash or part noncash] consideration for a business or asset acquired. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. Noncash or Part Noncash Acquisition, Noncash Financial or Equity Instrument Consideration Issuance of common stock in exchange for entities acquisition (Note 5) The cash outflow to reacquire preferred stock during the period, including expenses. Payments for Repurchase of Preferred Stock, including Expenses Repurchase of Series C preferred shares, including expenses (Note 10) The increase (decrease) during the reporting period in right-of-use asset under operating lease. Increase (Decrease) in Operating Lease Right-of-Use Asset Right of use asset under operating leases The increase (decrease) during the reporting period in the aggregate amount of drydock costs. Increase (Decrease) in Drydock Costs Drydock costs Term of the risk-free interest rate assumption that is used in valuing an option on its own shares, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Term Term of treasury yield Exercise price of $10.00 per share. Exercise Price, 10 [Member] $10.00 Exercise Price [Member] The grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. Share Based Compensation Arrangement by Share Based Payment Award, Options, Grants in Period, Grant Date Fair Value Fair value of award granted Exercise price of $12.50 per share. Exercise Price, 12.50 [Member] $12.50 Exercise Price [Member] Exercise price of $15.00 per share. Exercise Price, 15 [Member] $15.00 Exercise Price [Member] Exercise price of $20.00 per share. Exercise Price, 20 [Member] $20.00 Exercise Price [Member] Exercise price of $25.00 per share. Exercise Price, 25 [Member] $25.00 Exercise Price [Member] Exercise price of $30.00 per share. Exercise Price, 30 [Member] $30.00 Exercise Price [Member] The 2015 Equity Incentive Plan (2015 Plan) aligns the interests of eligible participants with those of the Company's stockholders by providing long-term incentive compensation opportunities tied to the performance of the Company and its Common Stock. The 2015 Plan is intended to advance the interests of the Company and increase stockholder value by attracting, retaining and motivating key personnel upon whose judgment, initiative and effort the successful conduct of the Company's business is largely dependent. Equity Incentive Plan 2015 [Member] 2015 Equity Incentive Plan [Member] The grant-date fair value of equity instruments other than options granted during the reporting period. Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other than Options, Grants in Period, Grant Date Fair Value Fair value of award granted Share-based payment arrangement granted on December 30, 2020. Awarded 2020-12-30 [Member] Awarded December 30, 2020 [Member] Share-based payment arrangement granted on February 15, 2018. Awarded 2018-02-15 [Member] Awarded February 15, 2018 [Member] Person with designation of executive officer and non executive directors. Executive Officers And Non Executive Directors [Member] Executive Officers and Non Executive Directors [Member] Number of common shares exchanged for newly issued shares of the Company's Series B Convertible Cumulative Perpetual Preferred Stock. Common Stock, Shares Exchanged Common stock, shares exchanged Cumulative perpetual preferred stock that may be exchanged into common shares or other types of securities at the owner's option. Series B Convertible Cumulative Perpetual Preferred Stock [Member] Number of shares of preferred stock issued for each share of common stock. Preferred Stock, Shares Issued Upon Exchange Preferred stock, shares issued upon exchange for each common share (in shares) Number of trading days used to determine the volume-weighted average price of common stock prior to the dividend payment date for preferred stock, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Number of Trading Days for Common Stock Number of trading days used to calculate volume-weighted average price of common stock Number of shares of common stock that can be exchanged for newly issued shares of the Company's Series B Convertible Cumulative Perpetual Preferred Stock. Common Stock, Shares that can be Exchanged Common stock, shares that can be exchanged (in shares) Period after issuance date when preferred stock can be redeemed at the Company's option, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Preferred Stock, Redemption Period Preferred stock, redemption period Tabular disclosure of the cost of borrowed funds accounted for as interest expense. Interest and Finance Costs [Table Text Block] Interest and Finance Costs The value of common stock that can be issued and sold from time to time under an at-the-market (ATM) continuous equity offering program. Common Stock that Can be Sold Value Common stock that can be sold under ATM Shares that have been repurchased during the period and are being held in treasury. Share Repurchase Program [Member] Share Repurchase Program [Member] Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt due after one year or beyond the operating cycle, if longer, excluding the current portion. Long-term Debt, Gross, Noncurrent Non-current portion of long-term debt Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt due within one year or the operating cycle, if longer. Long-term Debt, Gross, Current Current portion of long-term debt Secured term loan with Piraeus Bank S.A. (Piraeus Bank). Piraeus Bank Secured Term Loan [Member] Piraeus Bank Secured Term Loan [Member] Secured term loan with Nordea Bank Abp, Filial i Norge (Nordea Bank). Nordea Bank Secured Term Loan [Member] Nordea Bank Secured Term Loan [Member] Terminated loan agreement with Addiewell Ltd. Terminated Loan with Addiewell Ltd [Member] Terminated Loan with Addiewell LTD [Member] Secured term loans with Nordea Bank Abp, Filial i Norge (Nordea Bank) and Piraeus Bank S.A. (Piraeus Bank). Nordea Bank and Piraeus Bank Loans [Member] Nordea Bank and Piraeus Bank Loans [Member] Number of tanker vessels used as collateral to secure the debt instrument. Debt Instrument, Number of Tanker Vessels Used as Collateral Number of tanker vessels used as collateral Minimum amount of cash liquidity required under the debt instrument. Debt Instrument, Minimum Liquidity Requirement Minimum liquidity requirement Minimum term of charter used as security under loan agreements, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Minimum term of charter used as security under loan agreements Minimum term of charter used as security under loan agreements Percentage fee charged by a bank for setting up a loan. Debt Instrument, Arrangement fee percentage Arrangement fee percentage The number of balloon installment payments to be paid under the debt instrument. Debt Instrument, Number of Balloon Installment Payments Number of balloon installment payments The number of vessel-owning subsidiaries entering into a loan agreement. Debt Instrument, Number of Vessel-Owning Subsidiaries Entering Into Loan Agreement Number of vessel-owning subsidiaries entering into loan agreement The number of long term loan agreements entered by the Company's vessel-owning subsidiaries. Debt Instrument, Number of Long Term Loan Agreements Number of long term loans agreement Face amount of the debt instrument that is available for borrowing at time the agreement is executed and/or amended. Debt Instrument, Borrowing Capacity Borrowing capacity Period of time after a policy year before the relevant insurance policy year is closed and adjustments to estimates of premium income and anticipated and paid claims are completed by the Board of Directors of the P&I Association, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Closing Period for Relevant Insurance Policy Year Closing period for relevant insurance policy year Maximum pollution coverage per vessel per incident from the protection and indemnity association (P&I Association). Maximum Pollution Coverage Per Vessel Per Incident Pollution coverage per vessel per incident Amount of monthly lease cost under the lessee's operating lease contract. Operating Lease, Monthly Cost Monthly rent expense A provider of management services to the container vessels "Rotterdam" and "Domingo". Diana Wilhelmsen Management Limited [Member] DWM [Member] Sale and purchase commissions and chartering commissions on the gross freight and hire revenue of the tanker vessels. Sale and Purchase Commissions [Member] Commissions [Member] Brokerage services provided to the Company under a Brokerage Services Agreement for a fixed monthly fee per each tanker vessel owned by the Company. Brokerage Fees [Member] Brokerage Fees [Member] Primary financial statement caption encompassing net income (loss) from discontinued operations. Net Income (Loss) from Discontinued Operations [Member] Net Income (Loss) from Discontinued Operations [Member] Management fees on gross hire of the vessels. Management Fees [Member] A provider of brokerage services controlled by Chairman of the Board and former Chief Executive Officer, Mr. Symeon Palios. Steamship Shipbroking Enterprises Inc. [Member] Steamship Shipbroking [Member] The amount of costs incurred to terminate agreement with the related party. Related Party, Termination Costs Termination costs A travel agency controlled by the Company's Chairman of the Board, Mr. Symeon Palios. Altair Travel Agency S.A [Member] Altair [Member] A company controlled by the Company's Non-Executive Director and major shareholder Mrs Aliki Paliou that provides brokerage services to the Company. Pure Brokerage and Shipping Corp. [Member] Pure Brokerage [Member] Primary financial statement caption encompassing voyage expenses. Voyage Expenses [Member] Voyage Expenses [Member] Travel expenses incurred by the Company. Travel Expenses [Member] Travel Expenses [Member] Disclosures pertaining to physical assets used in the normal conduct of business and not intended for resale. Property, Plant and Equipment Disclosures [Table] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Property, Plant and Equipment Disclosures [Line Items] Vessels, net [Line Items] Tabular disclosure of vessels used in the normal conduct of business and not intended for resale. Vessels, Net [Table Text Block] Vessels, net Number of rights included with each share under the Rights Agreement. Class of Warrant or Right, Number of rights included with each share Number of rights included with each share under Rights Agreement Ownership percentage required after merger or other business combination that allows each holder of a right to purchase, upon payment of the exercise price, a number of shares of common stock. Class of Warrant or Right, Ownership percentage required after merger or other business combination Ownership percentage required after merger of other business combination Number of rights exercised during the period. Class of Warrant or Right, Rights Exercised Number of rights exercised (in shares) Beneficial ownership percentage of common shares required for rights to become exercisable. Class of Warrant or Right, Beneficial Ownership Percentage Beneficial ownership percentage required for rights to become exercisable Number of warrants exercised during the period. Class of Warrant or Right, Exercises in Period Warrants exercised (in shares) Series B-2 of preferred stock that may be exchanged into common shares or other types of securities at the owner's option. Series B-2 Preferred Stock [Member] Series B-2 Convertible Preferred Stock [Member] Series B-1 of preferred stock that may be exchanged into common shares or other types of securities at the owner's option. Series B-1 Preferred Stock [Member] Series B-1 Convertible Preferred Stock [Member] A direct offering of securities to a limited number of investors such as insurance companies, pension funds, mezzanine funds, stock funds and trusts that has been registered with the Securities and Exchange Commission (SEC). Registered Direct Offering [Member] Registered Direct Offering [Member]