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Long-Term Debt (Details Narrative)
1 Months Ended 3 Months Ended 4 Months Ended 5 Months Ended 6 Months Ended 7 Months Ended 8 Months Ended 9 Months Ended 12 Months Ended
Oct. 13, 2021
USD ($)
Jan. 19, 2021
USD ($)
Feb. 10, 2020
USD ($)
Mar. 23, 2023
USD ($)
Apr. 05, 2022
USD ($)
May 12, 2021
USD ($)
Apr. 30, 2021
USD ($)
May 31, 2021
USD ($)
May 24, 2019
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Jul. 31, 2023
USD ($)
Jul. 31, 2021
USD ($)
Sep. 04, 2019
USD ($)
Sep. 30, 2021
USD ($)
Oct. 03, 2019
USD ($)
Sep. 24, 2019
USD ($)
Sep. 23, 2019
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Nov. 19, 2019
USD ($)
Line of Credit Facility [Line Items]                                            
Proceeds from Lines of Credit                   $ 76,000,000 $ 60,000,000                      
Repayments of Debt                   (0) 276,671,000                      
Fees and related costs deferred                   1,140,000                   $ 9,655,000    
Amortization of Debt Issuance Costs                   $ 2,836,000 6,093,000                      
Debt Instrument, Covenant Description                   Amounts drawn under the facilities listed above are secured by first priority mortgages on certain of the Company’s vessels and other collateral. The credit facilities contain a number of restrictive covenants that limit the Company from, among other things: incurring or guaranteeing indebtedness; charging, pledging or encumbering the vessels; and changing the flag, class, management or ownership of the vessel owning entities. The credit facilities also require the vessels to comply with the ISM Code and ISPS Code and to maintain valid safety management certificates and documents of compliance at all times. Additionally, specific credit facilities require compliance with a number of financial covenants including asset cover ratios and minimum liquidity and corporate guarantor requirements. Among other events, it will be an event of default under the credit facilities if the financial covenants are not complied with or remedied.                        
Debt Instrument, Covenant Compliance                   As of June 30, 2023, and December 31, 2022, the Company was in compliance with its debt covenants.                        
8.00% Senior Unsecured Notes Due 2024 [Member]                                            
Line of Credit Facility [Line Items]                                            
Debt Instrument, Date of First Required Payment                   Feb. 29, 2020                        
Debt Instrument, Face Amount                   $ 4,125,000                       $ 27,500,000
Debt Instrument, Interest Rate, Stated Percentage                   8.00%                        
Debt Instrument, Maturity Date                   Dec. 31, 2024                        
Notes Payable, Fair Value Disclosure                   $ 0                        
8.00% Senior Unsecured Notes Due 2024 [Member] | Twelve Vessels [Member]                                            
Line of Credit Facility [Line Items]                                            
Payments for advances                           $ 233,890,000                
Net proceeds from issuance                   $ 35,000,000                        
$54.0 Million Sale and Leaseback agreement - CMBFL [Member]                                            
Line of Credit Facility [Line Items]                                            
Description of Scope                   to refinance one of the three previous tranches of the $180,500 Deutsche, CIT, HCOB, Entrust, Blue Ocean Credit Facility, that had a maturity date on June 30, 2022, of an amount $46,624.                        
Line of Credit Facility, Interest Rate Description                   LIBOR plus a margin                        
Debt Instrument, Basis Spread on Variable Rate                   3.25%                        
Outstanding amount                   $ 37,800,000                        
Drawn down date                   May 2021                        
Sale Leaseback Transaction, Date                   May 20, 2021                        
Finance Lease Liability Periodic Payment Terms, Balloon Payment to be Paid                   $ 19,980,000                        
Finance Lease Liability Maturity Date                   May 2028                        
Finance Lease, Liability                   $ 54,000,000                        
Sale Leaseback Transaction, Net Proceeds, Financing Activities               $ 54,000,000                            
Aggregate purchase price                   75,000,000                        
Advance Hire                   $ 21,000,000                        
$14.7 Million Sale and Leaseback agreement - Neptune Maritime Leasing [Member]                                            
Line of Credit Facility [Line Items]                                            
Description of Scope                   to finance the acquisition of GSL Violetta delivered in April 2021                        
Line of Credit Facility, Interest Rate Description                   LIBOR plus a margin                        
Debt Instrument, Basis Spread on Variable Rate                   4.64%                        
Outstanding amount                   $ 8,384,000                        
Sale Leaseback Transaction, Date                   May 12, 2021                        
Finance Lease Liability Periodic Payment Terms, Balloon Payment to be Paid                   $ 950,000                        
Finance Lease Liability Maturity Date                   February 2026                        
Finance Lease, Liability                   $ 14,735,000                        
Sale Leaseback Transaction, Net Proceeds, Financing Activities           $ 14,735,000                                
2027 Secured Notes (b) [Member]                                            
Line of Credit Facility [Line Items]                                            
Description of Scope                   for the repayment of the remaining outstanding balances on its New Hayfin Credit Facility and the Hellenic Bank Credit Facility (releasing five unencumbered vessels), and our 2024 Notes. The remaining amount of net proceeds were allocated for general corporate purposes.                        
Line of Credit Facility, Frequency of Payments                   An amount equal to 15% per annum of the original principal balance of each Note shall be paid in equal quarterly installments on the 15th day of each of January, April, July, and October starting October 15, 2022, and the remaining unpaid principal balance shall be due and payable on the maturity date of July 15, 2027.                        
Debt Instrument, Basis Spread on Variable Rate                   5.69%                        
Outstanding amount                   $ 310,625,000                        
Debt Instrument, Issuance Date                   Jun. 16, 2022                        
Debt Instrument, Repurchased Face Amount                   $ 350,000,000                        
Debt Instrument, Description of Variable Rate Basis                   interpolated interest rate of 2.84% plus a margin 2.85%                        
Number of vessels collateral                   20                        
Fees and related costs deferred                                       7,409,000    
Tranches A, E and F [Member] | $64.2 Million Hamburg Commercial Bank AG Credit Facility [Member]                                            
Line of Credit Facility [Line Items]                                            
Proceeds from Lines of Credit             $ 32,100,000                              
Maturity date                   April 2025                        
Tranches B and D [Member] | $64.2 Million Hamburg Commercial Bank AG Credit Facility [Member]                                            
Line of Credit Facility [Line Items]                                            
Proceeds from Lines of Credit               $ 21,400,000                            
Maturity date                   May 2025                        
Tranche C [Member] | $64.2 Million Hamburg Commercial Bank AG Credit Facility [Member]                                            
Line of Credit Facility [Line Items]                                            
Proceeds from Lines of Credit                           $ 10,700,000                
Maturity date                   July 2025                        
Eight Instalments [Member] | $54.0 Million Sale and Leaseback agreement - CMBFL [Member]                                            
Line of Credit Facility [Line Items]                                            
Line of Credit Facility, Frequency of Payments                   quarterly                        
Line of Credit Facility, Number of Repayment Installments                   8                        
Sale Leaseback Transaction, Quarterly Rental Payments                   $ 2,025,000                        
Twenty Instalments [Member] | $54.0 Million Sale and Leaseback agreement - CMBFL [Member]                                            
Line of Credit Facility [Line Items]                                            
Line of Credit Facility, Frequency of Payments                   quarterly                        
Line of Credit Facility, Number of Repayment Installments                   20                        
Sale Leaseback Transaction, Quarterly Rental Payments                   $ 891,000                        
Fifteen Instalments [Member] | $14.7 Million Sale and Leaseback agreement - Neptune Maritime Leasing [Member]                                            
Line of Credit Facility [Line Items]                                            
Line of Credit Facility, Frequency of Payments                   quarterly                        
Line of Credit Facility, Number of Repayment Installments                   15                        
Sale Leaseback Transaction, Quarterly Rental Payments                   $ 793,870                        
Four Instalments [Member] | $14.7 Million Sale and Leaseback agreement - Neptune Maritime Leasing [Member]                                            
Line of Credit Facility [Line Items]                                            
Line of Credit Facility, Frequency of Payments                   quarterly                        
Line of Credit Facility, Number of Repayment Installments                   4                        
Sale Leaseback Transaction, Quarterly Rental Payments                   $ 469,120                        
On or after December 31, 2021 and prior to December 31, 2022 [Member] | 8.00% Senior Unsecured Notes Due 2024 [Member]                                            
Line of Credit Facility [Line Items]                                            
Debt Instrument, Redemption Price, Percentage                   102.00%                        
On or after December 31, 2022 and prior to December 31, 2023 [Member] | 8.00% Senior Unsecured Notes Due 2024 [Member]                                            
Line of Credit Facility [Line Items]                                            
Debt Instrument, Redemption Price, Percentage                   101.00%                        
On or after December 31, 2023 and prior to maturity [Member] | 8.00% Senior Unsecured Notes Due 2024 [Member]                                            
Line of Credit Facility [Line Items]                                            
Debt Instrument, Redemption Price, Percentage                   100.00%                        
Redeemed Notes [Member] | 8.00% Senior Unsecured Notes Due 2024 [Member]                                            
Line of Credit Facility [Line Items]                                            
Debt Instrument, Repurchased Face Amount         $ 28,500,000                                  
Debt Instrument, Redemption Price, Percentage         102.00%                                  
Notes Payable, Fair Value Disclosure         $ 89,020,000                                  
Gain (Loss) on Repurchase of Debt Instrument                                       2,350,000    
Macquarie loan (a) [Member]                                            
Line of Credit Facility [Line Items]                                            
Issuance date of debt instrument                   May 18, 2023                        
Proceeds from Lines of Credit                   $ 76,000,000                        
Description of Scope                   to finance part of the acquisition cost of the four 8,544 TEU vessels for an aggregate purchase price of $123.3 million                        
Repayment installments                   4                        
Maturity date                   May 2026                        
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid                   $ 25,000,000                        
Line of Credit Facility, Interest Rate Description                   SOFR plus a margin                        
Debt Instrument, Basis Spread on Variable Rate                   3.50%                        
Outstanding amount                   $ 76,000,000                   0    
Fees and related costs deferred                   $ 1,140,000                        
Macquarie loan (a) [Member] | First Two Installments [Member]                                            
Line of Credit Facility [Line Items]                                            
Repayment installments                   2                        
Line of Credit Facility, Frequency of Payments                   quarterly                        
Line of Credit Facility, Periodic Payment                   $ 5,000,000                        
Macquarie loan (a) [Member] | Next Six Installments [Member]                                            
Line of Credit Facility [Line Items]                                            
Repayment installments                   6                        
Line of Credit Facility, Frequency of Payments                   quarterly                        
Line of Credit Facility, Periodic Payment                   $ 6,000,000                        
Macquarie loan (a) [Member] | One Installment [Member]                                            
Line of Credit Facility [Line Items]                                            
Repayment installments                   1                        
Line of Credit Facility, Frequency of Payments                   quarterly                        
Line of Credit Facility, Periodic Payment                   $ 3,000,000                        
Macquarie loan (a) [Member] | Other Two Installments [Member]                                            
Line of Credit Facility [Line Items]                                            
Repayment installments                   2                        
Line of Credit Facility, Frequency of Payments                   quarterly                        
Line of Credit Facility, Periodic Payment                   $ 1,000,000                        
E.SUN, MICB, Cathay, Taishin Credit Facility (c) [Member]                                            
Line of Credit Facility [Line Items]                                            
Issuance date of debt instrument                   December 30, 2021                        
Description of Scope                   The Company using a portion of the net proceeds from this credit facility fully prepaid the outstanding amount of the Blue Ocean Junior Credit facility                        
Line of Credit Facility, Interest Rate Description                   LIBOR plus a margin                        
Debt Instrument, Basis Spread on Variable Rate                   2.75%                        
Outstanding amount                   $ 37,500,000                   46,500,000    
Number of tranches                   3                        
Drawn down date                   January 2022                        
Fees and related costs deferred                                       1,180,000    
E.SUN, MICB, Cathay, Taishin Credit Facility (c) [Member] | Eight Installments [Member]                                            
Line of Credit Facility [Line Items]                                            
Repayment installments                   8                        
Line of Credit Facility, Frequency of Payments                   quarterly                        
Line of Credit Facility, Periodic Payment                   $ 4,500,000                        
E.SUN, MICB, Cathay, Taishin Credit Facility (c) [Member] | Ten Installments [Member]                                            
Line of Credit Facility [Line Items]                                            
Repayment installments                   10                        
Line of Credit Facility, Frequency of Payments                   quarterly                        
Line of Credit Facility, Periodic Payment                   $ 2,400,000                        
$38.5 Million Blue Ocean Junior Credit Facility [Member]                                            
Line of Credit Facility [Line Items]                                            
Issuance date of debt instrument                   September 19, 2019                        
Proceeds from Lines of Credit                                     $ 38,500,000      
Description of Scope                   in order to refinance that existing facility with the only substantive change being to extend maturity at the same date with the Syndicated Senior Secured Credit Facility.                        
Repayment installments                   1                        
Outstanding amount                   $ 0                        
Repayments of Debt                   26,205,000                     $ 12,295,000  
Fees on repayments of debt                   $ 3,968,000                     $ 1,618,000  
Line of Credit Facility, Expiration Date                   Sep. 24, 2024                        
Debt Instrument, Interest Rate, Stated Percentage                   10.00%                        
$12.0 Million Sinopac Capital International Credit Facility [Member]                                            
Line of Credit Facility [Line Items]                                            
Issuance date of debt instrument                   August 27, 2021                        
Proceeds from Lines of Credit                                       12,000,000    
Description of Scope                   partially used to fully refinance the Hayfin Credit Facility.                        
Repayment installments                   20                        
Maturity date                   September 2026                        
Line of Credit Facility, Frequency of Payments                   quarterly                        
Line of Credit Facility, Periodic Payment                   $ 420,000                        
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid                   $ 3,600,000                        
Line of Credit Facility, Interest Rate Description                   LIBOR plus a margin                        
Debt Instrument, Basis Spread on Variable Rate                   3.25%                        
Outstanding amount                   $ 9,060,000                        
$140.0 Million HBOC, CACIB, ESUN, CTBC, Taishin Credit Facility [Member]                                            
Line of Credit Facility [Line Items]                                            
Issuance date of debt instrument                   July 6, 2021                        
Proceeds from Lines of Credit                         $ 140,000,000                  
Description of Scope                   to finance the acquisition of the Twelve Vessels                        
Maturity date                   July 2026                        
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid                   $ 35,600,000                        
Line of Credit Facility, Interest Rate Description                   LIBOR plus a margin                        
Debt Instrument, Basis Spread on Variable Rate                   3.25%                        
Outstanding amount                   $ 83,869,000                        
Repayments of Debt       $ 2,838,000                                    
Line of Credit Facility, Collateral                   the vessel was released as collateral under the Company’s $140.0 Million HCOB, CACIB, ESUN, CTBC, Taishin Credit Facility                        
$140.0 Million HBOC, CACIB, ESUN, CTBC, Taishin Credit Facility [Member] | First Six Installments [Member]                                            
Line of Credit Facility [Line Items]                                            
Repayment installments                   6                        
Line of Credit Facility, Frequency of Payments                   quarterly                        
Line of Credit Facility, Periodic Payment                   $ 8,000,000                        
$140.0 Million HBOC, CACIB, ESUN, CTBC, Taishin Credit Facility [Member] | Next Eight Installments [Member]                                            
Line of Credit Facility [Line Items]                                            
Repayment installments                   8                        
Line of Credit Facility, Frequency of Payments                   quarterly                        
Line of Credit Facility, Periodic Payment                   $ 5,400,000                        
$140.0 Million HBOC, CACIB, ESUN, CTBC, Taishin Credit Facility [Member] | Last Six Installments [Member]                                            
Line of Credit Facility [Line Items]                                            
Repayment installments                   6                        
Line of Credit Facility, Frequency of Payments                   quarterly                        
Line of Credit Facility, Periodic Payment                   $ 2,200,000                        
$51.7 Million Deutsche Bank AG Credit Facility [Member]                                            
Line of Credit Facility [Line Items]                                            
Issuance date of debt instrument                   May 6, 2021                        
Description of Scope                   in order to refinance one of the three previous tranches of the $180,500 Deutsche, CIT, HCOB, Entrust, Blue Ocean Credit Facility, that had a maturity date on June 30, 2022, of an amount $48,527.                        
Repayment installments                   20                        
Line of Credit Facility, Frequency of Payments                   quarterly                        
Line of Credit Facility, Periodic Payment                   $ 1,162,450                        
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid                   $ 28,421,000                        
Line of Credit Facility, Interest Rate Description                   LIBOR plus a margin                        
Debt Instrument, Basis Spread on Variable Rate                   3.25%                        
Outstanding amount                   $ 42,370,000                        
Line of Credit Facility, Maximum Borrowing Capacity                   $ 51,670,000                        
$64.2 Million Hamburg Commercial Bank AG Credit Facility [Member]                                            
Line of Credit Facility [Line Items]                                            
Issuance date of debt instrument                   April 15, 2021                        
Description of Scope                   in order to finance the acquisition of six out of the Seven Vessels                        
Line of Credit Facility, Interest Rate Description                   LIBOR plus a margin                        
Debt Instrument, Basis Spread on Variable Rate                   3.50%                        
Outstanding amount                   $ 32,769,000                        
Line of Credit Facility, Maximum Borrowing Capacity                   $ 64,200,000                        
$64.2 Million Hamburg Commercial Bank AG Credit Facility [Member] | Each Tranche [Member]                                            
Line of Credit Facility [Line Items]                                            
Repayment installments                   16                        
Line of Credit Facility, Frequency of Payments                   quarterly                        
Line of Credit Facility, Periodic Payment                   $ 668,750                        
$51.7 Million CACIB, Bank Sinopac, CTBC Credit Facility [Member]                                            
Line of Credit Facility [Line Items]                                            
Issuance date of debt instrument                   April 13, 2021                        
Description of Scope                   in order to refinance one of the three previous tranches of the $180,500 Deutsche, CIT, HCOB, Entrust, Blue Ocean Credit Facility, that had a maturity date on June 30, 2022, of an amount $48,648.                        
Repayment installments                   20                        
Maturity date                   April 2026                        
Line of Credit Facility, Frequency of Payments                   quarterly                        
Line of Credit Facility, Periodic Payment                   $ 1,275,000                        
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid                   $ 26,200,000                        
Line of Credit Facility, Interest Rate Description                   LIBOR plus a margin                        
Debt Instrument, Basis Spread on Variable Rate                   2.75%                        
Outstanding amount                   $ 41,500,000                        
Line of Credit Facility, Maximum Borrowing Capacity                   $ 51,700,000                        
$9.0 Million Chailease Credit Facility [Member]                                            
Line of Credit Facility [Line Items]                                            
Issuance date of debt instrument                   February 26, 2020                        
Description of Scope                   for the refinance of DVB Credit Facility                        
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid                   $ 1,314,000                        
Line of Credit Facility, Interest Rate Description                   LIBOR plus a margin                        
Debt Instrument, Basis Spread on Variable Rate                   4.20%                        
Outstanding amount                   $ 3,039,000                        
Line of Credit Facility, Maximum Borrowing Capacity                   $ 9,000,000                        
$9.0 Million Chailease Credit Facility [Member] | 36 Installments [Member]                                            
Line of Credit Facility [Line Items]                                            
Line of Credit Facility, Frequency of Payments                   monthly                        
Line of Credit Facility, Periodic Payment                   $ 156,000                        
$9.0 Million Chailease Credit Facility [Member] | 24 Installments [Member]                                            
Line of Credit Facility [Line Items]                                            
Line of Credit Facility, Frequency of Payments                   monthly                        
Line of Credit Facility, Periodic Payment                   $ 86,000                        
$268.0 Million Syndicated Senior Secured Credit Facility [Member]                                            
Line of Credit Facility [Line Items]                                            
Issuance date of debt instrument                   September 19, 2019                        
Description of Scope                   in order to refinance existing credit facilities that had a maturity date in December 2020, of an amount $224,310.                        
Line of Credit Facility, Interest Rate Description                   amended certain covenants in the Company’s favor at an unchanged rate of LIBOR + 3.00%. On July 1, 2022, the interest rate is SOFR plus a margin of 3.00% plus Credit Adjustment Spread (“CAS”) and is payable at each quarter end date.                        
Debt Instrument, Basis Spread on Variable Rate                   3.00%                        
Outstanding amount                   $ 165,200,000                        
Number of loan tranches                   2                        
Fees and related costs deferred                                       $ 1,066,000    
$268.0 Million Syndicated Senior Secured Credit Facility [Member] | Tranche A [Member]                                            
Line of Credit Facility [Line Items]                                            
Proceeds from Lines of Credit                                   $ 230,000,000        
Repayment installments                   20                        
Line of Credit Facility, Frequency of Payments                   quarterly                        
Line of Credit Facility, Periodic Payment                   $ 5,200,000                        
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid                   $ 126,000,000                        
Debt Instrument, Date of First Required Payment                   Dec. 12, 2019                        
Line of Credit Facility, Expiration Date                   Sep. 24, 2024                        
$268.0 Million Syndicated Senior Secured Credit Facility [Member] | Tranche B [Member]                                            
Line of Credit Facility [Line Items]                                            
Proceeds from Lines of Credit     $ 38,000,000                                      
Repayment installments                   20                        
Maturity date                   December 2026                        
Line of Credit Facility, Frequency of Payments                   quarterly                        
Line of Credit Facility, Periodic Payment                   $ 1,000,000                        
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid                   $ 18,000,000                        
$120.0 Million - Sale and Leaseback agreements - CMBFL Four Vessels [Member]                                            
Line of Credit Facility [Line Items]                                            
Proceeds from Lines of Credit $ 30,000,000                             $ 90,000,000            
Description of Scope                   to finance the acquisition of the Four Vessels                        
Line of Credit Facility, Interest Rate Description                   LIBOR plus a margin                        
Debt Instrument, Basis Spread on Variable Rate                   3.25%                        
Outstanding amount                   $ 77,137,000                        
Drawn down date                   September 30, 2021                        
Sale Leaseback Transaction, Date                   August 26, 2021                        
Number of sale and leaseback agreements                   4                        
Finance Lease Liability Periodic Payment Terms, Balloon Payment to be Paid                   $ 7,000,000                        
Finance Lease Liability Maturity Date                   three vessels mature in September 2027 and for the fourth vessel in October 2027                        
$120.0 Million - Sale and Leaseback agreements - CMBFL Four Vessels [Member] | First Twelve Quarterly Installments [Member]                                            
Line of Credit Facility [Line Items]                                            
Line of Credit Facility, Frequency of Payments                   quarterly                        
Line of Credit Facility, Number of Repayment Installments                   12                        
Sale Leaseback Transaction, Quarterly Rental Payments                   $ 1,587,500                        
$120.0 Million - Sale and Leaseback agreements - CMBFL Four Vessels [Member] | Next Twelve Quarterly Installments [Member]                                            
Line of Credit Facility [Line Items]                                            
Line of Credit Facility, Frequency of Payments                   quarterly                        
Line of Credit Facility, Number of Repayment Installments                   12                        
Sale Leaseback Transaction, Quarterly Rental Payments                   $ 329,200                        
$236.2 Million Senior secured loan facility with Hayfin Management, LLP [Member]                                            
Line of Credit Facility [Line Items]                                            
Issuance date of debt instrument                   January 7, 2021                        
Proceeds from Lines of Credit   $ 236,200,000                                        
Description of Scope                   The proceeds from the New Hayfin Credit Facility, along with cash on hand, were used to optionally redeem in full the outstanding 2022 Notes on January 20, 2021.                        
Repayment installments                   20                        
Maturity date                   January 2026                        
Line of Credit Facility, Frequency of Payments                   quarterly                        
Line of Credit Facility, Periodic Payment                   $ 6,560,000                        
Line of Credit Facility, Interest Rate Description                   LIBOR plus a margin                        
Debt Instrument, Basis Spread on Variable Rate                   7.00%                        
Outstanding amount                   $ 0                        
Repayments of Debt                     197,569,000 $ 5,831,000                    
Fees on repayments of debt                     $ 11,229,000                      
Line of Credit Facility, Collateral                   The New Hayfin Credit Facility is secured by, among other things, first priority ship mortgages over 21 of the Company’s vessels, assignments of earnings and insurances of the mortgaged vessels, pledges over certain bank accounts, as well as share pledges over the equity interests of each mortgaged vessel-owning subsidiary.                        
$59.0 Million Hellenic Bank Credit Facility [Member]                                            
Line of Credit Facility [Line Items]                                            
Issuance date of debt instrument                   May 23, 2019                        
Description of Scope                   were used in connection with the acquisition of the vessels GSL Eleni, GSL Grania and GSL Kalliopi.                        
Line of Credit Facility, Maximum Borrowing Capacity                   $ 37,000,000                        
$59.0 Million Hellenic Bank Credit Facility [Member] | Tranche A [Member] | GSL Eleni [Member]                                            
Line of Credit Facility [Line Items]                                            
Proceeds from Lines of Credit                 $ 13,000,000                          
Repayment installments                   20                        
Line of Credit Facility, Frequency of Payments                   quarterly                        
Line of Credit Facility, Periodic Payment                   $ 450,000                        
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid                   $ 4,000,000                        
$59.0 Million Hellenic Bank Credit Facility [Member] | Tranche B [Member] | GSL Grania [Member]                                            
Line of Credit Facility [Line Items]                                            
Proceeds from Lines of Credit                             $ 12,000,000              
Repayment installments                   20                        
Line of Credit Facility, Frequency of Payments                   quarterly                        
Line of Credit Facility, Periodic Payment                   $ 400,000                        
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid                   $ 4,000,000                        
$59.0 Million Hellenic Bank Credit Facility [Member] | Tranche C [Member] | GSL Kalliopi [Member]                                            
Line of Credit Facility [Line Items]                                            
Proceeds from Lines of Credit                                 $ 12,000,000          
Repayment installments                   20                        
Line of Credit Facility, Frequency of Payments                   quarterly                        
Line of Credit Facility, Periodic Payment                   $ 400,000                        
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid                   4,000,000                        
$59.0 Million Hellenic Bank Credit Facility [Member] | Amended and restated loan agreement [Member]                                            
Line of Credit Facility [Line Items]                                            
Proceeds from Lines of Credit                   $ 22,000,000                        
Description of Scope                   to be used in connection with the acquisition of the vessels GSL Vinia and GSL Christel Elisabeth.                        
Repayment installments                   20                        
Line of Credit Facility, Frequency of Payments                   quarterly                        
Line of Credit Facility, Periodic Payment                   $ 375,000                        
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid                   $ 3,500,000                        
Line of Credit Facility, Interest Rate Description                   LIBOR plus a margin                        
Debt Instrument, Basis Spread on Variable Rate                   3.90%                        
Outstanding amount                   $ 0                        
Drawn down date                   December 10, 2019                        
Number of loan tranches                   2                        
Issuance date of debt instrument                   Dec. 10, 2019                        
Prepayment date                   June 24, 2022