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Note 15 - Asset Dispositions, Assets Held for Sale and Asset Impairments (Details Textual)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2019
Number of Vessels, Held for Sale 24 46 38   24 46 46
Number of Additional Vessels to be Sold 0 22 0   22    
Number of Vessels Sold 22 14 8   44    
Number of Revalued Vessels Held for Sale   24 38        
Impairment of Long-Lived Assets to be Disposed of   $ 5,600   $ 10,200 $ 65,700    
Impairment of Assets Transferred to Held for Sale $ 0 49,900          
Percentage Reduction in the Value of Vessels Due to the Effetcs of Completing Quick Sale 10.00%       10.00%    
Number of Total Vessels Sold         47    
Number of Active Vessels Sold         3    
Gain (Loss) on Sale of Assets and Asset Impairment Charges $ 500 $ 1,700 $ 5,300   $ 7,500    
Marine Service and Vessel Supplies and Parts Inventory [Member]              
Inventory Write-down         $ 1,900 $ 5,200