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Note 9 - Commitments and Contingencies (Details Textual)
$ in Millions
Jun. 30, 2022
USD ($)
May 20, 2022
USD ($)
Mar. 18, 2022
USD ($)
Jan. 28, 2022
USD ($)
Jun. 29, 2021
USD ($)
Future Gross Minimum Revenues Under Non-cancellable Time Charter Agreements $ 385.2        
Future Gross Minimum Revenues Under Non-cancellable Time Charter Agreements, Due in Rolling Year One 176.4        
Future Gross Minimum Revenues Under Non-cancellable Time Charter Agreements, Due in Rolling Year Two 131.2        
Future Gross Minimum Revenues Under Non-cancellable Time Charter Agreements, Due in Rolling Year Three 64.4        
Future Gross Minimum Revenues Under Non-cancellable Time Charter Agreements, Due in Rolling Year Four $ 13.2        
Eco Design Fuel Efficient Containerships [Member]          
Number of Vessels Under Construction 9 2 3 2 2
Construction of Vessels, Amount to Be Financed with a Combination of Debt and Equity $ 352.9 $ 86.7 $ 103.8 $ 86.3 $ 76.1
Construction of Vessel, Future Minimum Payments Due, Next Twelve Months 100.6        
Construction of Vessel, Future Minimum Payments Due in Two Years 157.9        
Construction of Vessel, Future Minimum Payments Due in Three Years $ 56.7