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Note 4 - Investment in Unconsolidated Affiliates - Company Operations Due from Affiliates (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Less impairment of due from affiliate $ (400) $ (52,981) $ 0
Sonatide Marine Ltd [Member]      
Due from Sonatide at beginning of year 41,623 89,246 109,176
Revenue earned by the company through Sonatide 41,775 44,254 52,372
Less amounts received from Sonatide (26,429) (36,160) (60,486)
Less amounts used to offset Due to Sonatide obligations (A) [1] (8,530) (11,848) (10,551)
Less impairment of due from affiliate (400) (40,900) 0
Other 972 (2,969) (1,265)
Due from Affiliates $ 49,011 $ 41,623 $ 89,246
[1] We reduced the respective due from affiliates and due to affiliates balances each period through netting transactions based on agreement with the joint venture.