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Note 15 - Asset Dispositions, Assets Held for Sale and Asset Impairments (Details Textual)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
Dec. 31, 2020
USD ($)
Number of Vessels, Held for Sale 20   46 23
Number of Vessels, Held for Sale, Addition,Percentage     20.00%  
Number of Vessels, Held for Sale, Addition   0   32
Number of Vessels, Held for Sale, Sold 3 8   53
Asset Held For Sale, Net Book Value $ 31,200     $ 34,400
Proceeds from Sale of Assets 11,000 $ 9,500    
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property $ (1,948) 5,331    
Impairment of Long-Lived Assets to be Disposed of   $ 10,200    
Number of Additional Vessels to be Sold 0      
Impairment of Assets Transferred to Held for Sale $ 0