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Note 8 - Asset Held for Sale, Asset Sales and Asset Impairments (Details Textual)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2020
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2011
USD ($)
Number of Vessels, Held for Sale, Addition   46 32        
Number of Vessels, Held for Sale, Addition,Percentage   20.00%          
Number of Vessels, Held for Sale, Sold       53      
Number of Vessels, Transfer from Held for Sale to Active Fleet       2      
Number of Vessels, Held for Sale 23   23 23      
Impairment of Long-Lived Assets to be Disposed of       $ 75,200      
Asset Impairment Charges, Total       74,109 $ 37,773 $ 61,132  
Other Assets, Total             $ 1,800
Unpaid Milestone Payments         4,000    
Impairment Charge On Under Construction Asset   $ 5,800          
Expense Recovered on contract to Shipyard $ 4,000            
Vessel, Obsolete Inventory [Member]              
Asset Impairment Charges, Total   $ 5,200   $ 2,959 $ 5,223 $ 0