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Note 15 - Asset Dispositions, Assets Held for Sale and Asset Impairments - Activity in Assets Held for Sale (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Beginning balance     18  
Additions     1 2
Sales       (9)
Impairment $ 0 $ (1,912) $ (0) $ 1,912
Ending balance 8   8  
Impairment $ 0 $ 1,912 $ 0 $ (1,912)
Vessels Held for Sale [Member]        
Beginning balance 9 14 18 23
Beginning balance $ 6,862 $ 17,214 $ 14,421 $ 34,396
Additions 0 2 1 2
Additions $ 0 $ 4,089 $ 2,500 $ 4,089
Sales (1) (1) (10) (9)
Sales $ (47) $ (1,250) $ (8,606) $ (15,432)
Transfers 0 (1) (1) (2)
Transfers $ 0 $ (250) $ (1,500) $ (3,250)
Ending balance 8 14 8 14
Ending balance $ 6,815 $ 17,891 $ 6,815 $ 17,891