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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.

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