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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, 2022
USD ($)
Mar. 31, 2022
USD ($)
Sep. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Dec. 31, 2021
Number of Vessels, Held for Sale, Addition         1 2  
Number Of Vessels Sold Or Scrapped 10       10    
Number of Vessels, Held for Sale, Reactivation         1    
Number of Vessels, Held for Sale 8       8   18
Asset Held For Sale, Net Book Value         $ 6,800    
Number of Active Vessels Sold         0 10  
Proceeds from Sale of Vessels         $ 8,500 $ 34,000  
Gain (Loss) on Sale of Assets and Asset Impairment Charges         (800) $ (3,000)  
Number of Vessels, Held for Sale, Sold           9  
Proceeds from Sale of Productive Assets, Total         8,475 $ 33,956  
Impairment Charge Recaptured   $ 500       1,700  
Impairment of Long-Lived Assets to be Disposed of $ 0   $ (1,912)   (0) 1,912  
Asset Impairment Charges, Total 1,214   2,167   714 2,167  
Vessel, Obsolete Inventory [Member]              
Asset Impairment Charges, Total $ 1,200   $ 1,900   $ 1,200 $ 1,900  
Third-party Operator, Family Member of Director [Member]              
Gain (Loss) on Sale of Assets and Asset Impairment Charges       $ 4,300      
Proceeds from Sale of Productive Assets, Total       $ 11,400