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Note 15 - Asset Dispositions, Assets Held for Sale and Asset Impairments (Details Textual)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
Number of Vessels, Held for Sale   14   23 46
Number of Vessels, Held for Sale, Addition     22 32  
Number of Vessels, Held for Sale, Sold   8   53  
Asset Held For Sale, Net Book Value   $ 17,200   $ 34,400  
Number of Vessels, Held for Sale, Reactivation   1      
Number of Active Vessels Sold   5 3    
Proceeds from Sale of Productive Assets, Total   $ 29,560 $ 20,906    
Gain (Loss) on Sale of Assets and Asset Impairment Charges   (2,900) 7,000    
Proceeds from Sale of Vessels   29,400      
Impairment of Assets Transferred to Held for Sale   $ 0 65,700    
Number of Additional Vessels to be Sold   0      
Number of Revalued Vessels Sold 24        
Impairment of Long-Lived Assets to be Disposed of $ 5,600   49,900    
Assets Held-for-sale, Not Part of Disposal Group, Total $ 49,900   $ 49,900    
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