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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 12 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
Number of Vessels, Held for Sale 14 14   23 46
Number of Vessels, Held for Sale, Addition   2   32  
Number of Vessels, Held for Sale, Sold   9   53  
Asset Held For Sale, Net Book Value   $ 17,900   $ 34,400  
Number of Vessels, Held for Sale, Reactivation   2      
Number of Active Vessels Sold   10 3    
Proceeds from Sale of Productive Assets, Total   $ 33,956 $ 31,498    
Gain (Loss) on Sale of Assets and Asset Impairment Charges   (3,000) 7,500    
Proceeds from Sale of Vessels   34,000      
Impairment of Assets Transferred to Held for Sale   1,900 65,700    
Impairment Charge Recaptured $ 1,700        
Fair Value, Inputs, Level 3 [Member]          
Impairment of Long-Lived Assets to be Disposed of   1,900 $ 1,900    
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