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Note 7 - Assets Held for Sale, Asset Sales and Asset Impairments (Details Textual)
$ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2011
USD ($)
Number of Vessels, Held for Sale, Addition       7 32 46  
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       3 2    
Number of Vessels, Held for Sale   23   18 23    
Number of Active Vessels Sold       10 3    
Number of Vessels Sold       9      
Proceeds from Sale of Productive Assets, Total       $ 34,010 $ 38,296 $ 28,847  
Proceeds from Sale of Vessels and Other Assets       34,000 38,300    
Impairment of Long-Lived Assets to be Disposed of       13,700 75,200 26,700  
Impairment Charge Recaptured       1,700 1,000    
Asset Impairment Charges, Total       15,643 74,109 37,773  
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 $ 1,905 $ 2,959 $ 5,223  
Third-party Operator, Family Member of Director [Member]              
Proceeds from Sale of Productive Assets, Total $ 11,400            
Gain (Loss) on Sale of Assets and Asset Impairment Charges $ 4,300