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Share Capital (Details Narrative)
$ / shares in Units, $ in Thousands
 1 Months Ended 2 Months Ended 3 Months Ended 4 Months Ended 6 Months Ended 8 Months Ended 9 Months Ended 10 Months Ended 12 Months Ended
Jan. 26, 2021
USD ($)
$ / shares
shares
Feb. 17, 2021
USD ($)
shares
Jun. 30, 2023
$ / shares
shares
Mar. 31, 2023
USD ($)
shares
Jun. 30, 2022
shares
Apr. 30, 2020
shares
Jun. 30, 2023
USD ($)
$ / shares
shares
Sep. 01, 2021
shares
Aug. 20, 2014
USD ($)
$ / shares
Sep. 30, 2022
shares
Oct. 31, 2022
shares
Dec. 31, 2022
shares
Dec. 29, 2022
USD ($)
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
shares
Classes of common shares     1       1                  
Stock Issued During Period, Value, New Issues | $       $ 102                        
2019 ATM Agreement [Member]                                
Proceeds from Issuance of Redeemable Preferred Stock | $ | $                           $ 51,234 $ 18,847 $ 856
Shares Issued                           2,076,992 839,442 42,756
2022 ATM Agreement [Member]                                
Stock Issued During Period, Value, New Issues | $                         $ 150,000,000      
Stock Offering Cost | $             $ 0                  
January 2021 Equity Offering [Member]                                
Stock Issued During Period, Shares, New Issues 5,400,000 141,959                            
Shares Issued, Price Per Share | $ / shares $ 13.00                              
Proceeds from Issuance or Sale of Equity | $ $ 70,200 $ 67,758                            
Common Class A | 2019 Plan [Member]                                
Stock Issued During Period, Shares, New Issues           184,270 142,868         586,819   747,604    
Common Stock [Member]                                
Stock Repurchased and Retired During Period, Shares     385,064 582,178 184,684     521,650                
Stock Issued During Period, Value, New Issues | $       $ 0                        
Common Class A [Member]                                
Common Stock, Shares, Outstanding     35,165,914       35,165,914         35,990,288        
Stock Issued During Period, Shares, New Issues                           747,604    
Stock Repurchased and Retired During Period, Shares         184,684         568,835 307,121          
Repurchased common shares             967,242                  
Series B Preferred Stock [Member]                                
Preferred shares issuance term description             On August 20, 2014, the Company issued 1,400,000 Depositary Shares (the "Depositary Shares"), each of which represents 1/100th of one share of the Company's 8.75% Series B Cumulative Perpetual Preferred Shares ("Series B Preferred Shares") representing an interest in 14,000 Series B Preferred Shares, par value $0.01 per share, with a liquidation preference of $2,500.00 per share (equivalent to $25.00 per Depositary Share) (NYSE:GSL-B), priced at $25.00 per Depositary Share.                  
Redemption price per depositary share | $ / shares                 $ 25.00              
Proceeds from Issuance of Redeemable Preferred Stock | $ | $                 $ 33,497              
Preferred Stock, Dividend Rate, Percentage                 8.75%              
Preferred Stock, Redemption Terms             At any time after August 20, 2019 (or within 180 days after the occurrence of a fundamental change), the Series B Preferred Shares may be redeemed, at the discretion of the Company, in whole or in part, at a redemption price of $2,500.00 per share (equivalent to $25.00 per depositary share).                  
Preferred Stock, Redemption Price Per Share | $ / shares     $ 2,500.00       $ 2,500.00                  
Preferred Stock, Shares Outstanding     43,592       43,592         43,592        
Desositary shares outstanding     4,359,190       4,359,190                  
Series B Preferred Stock [Member] | 2019 ATM Agreement [Member]                                
Preferred Stock, Shares Outstanding                             8,394 428