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Note 14 - Assets Held for Sale, Asset Sales and Asset Impairments (Details Textual)
$ in Thousands
 3 Months Ended 39 Months Ended
Mar. 31, 2022
USD ($)
Dec. 31, 2021
Mar. 31, 2021
USD ($)
Mar. 31, 2022
Number of Vessels, Held for Sale 12 18   85
Number of Vessels, Held for Sale, Sold 5     67
Number of Vessels, Transfer from Held for Sale to Active Fleet       6
Number of Vessels, Held for Sale, Addition 0      
Number of Vessels, Held for Sale, Reactivation 1      
Asset Held For Sale, Net Book Value $ 8,600      
Number of Active Vessels Sold 0   3  
Proceeds from Sale of Vessels $ 4,600   $ 11,000  
Gain (Loss) on Sale of Assets and Asset Impairment Charges 200   (1,900)  
Impairment Charge Recaptured 500      
Impairment of Long-Lived Assets to be Disposed of $ 0   $ 0