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Note 15 - Asset Dispositions, Asset Held for Sale and Asset Impairments - Activity in Assets Held for Sale (Details)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Beginning balance     23 46 46
Additions       22 32
Sales     (8)   (53)
Transfers (1) 0 (1)  
Transfers $ (3,000) $ 0 $ (3,000) $ 0  
Ending balance 14   14   23
Ending balance   $ 49,900   $ 49,900  
Vessels Held for Sale [Member]          
Beginning balance 20 38 23 46 46
Beginning balance $ 31,214 $ 26,142 $ 34,396 $ 39,287 $ 39,287
Additions 0 22 0 22  
Additions $ 0 $ 65,811 $ 0 $ 65,811  
Sales (5) (14) (8) (22)  
Sales $ (11,000) $ (7,407) $ (14,182) $ (10,345)  
Impairment $ (55,482) $ 0 $ (65,689)  
Ending balance 14 46 14 46 23
Ending balance $ 17,214 $ 29,064 $ 17,214 $ 29,064 $ 34,396