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Note 5 - Investment in Unconsolidated Affiliates - Company Operations Due from Affiliates (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Less impairment of due from affiliate |  | $ 0 | $ (400) | $ (52,981)
Sonatide Marine Ltd [Member] |  |  |  |
Due from Sonatide at beginning of year |  | 49,011 | 41,623 | 89,246
Revenue earned by the company through Sonatide |  | 0 | 41,775 | 44,254
Less amounts received from Sonatide |  | 0 | (26,429) | (36,160)
Less amounts used to offset Due to Sonatide obligations (A) | [1] | 0 | (8,530) | (11,848)
Less impairment of due from affiliate |  | 0 | (400) | (40,900)
Write off of due from affiliate in connection with the acquisition |  | (49,011) | 0 | 0
Other |  | 0 | 972 | (2,969)
Due from Affiliates |  | $ 0 | $ 49,011 | $ 41,623
[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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