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Note 5 - Investment in Unconsolidated Affiliates - Company Operations Due from Affiliates (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Less impairment of due from affiliate |  | $ 0 | $ 0 | $ (400)
Sonatide Marine Ltd [Member] |  |  |  |
Due from Sonatide at beginning of year |  | 0 | 49,011 | 41,623
Revenue earned by the company through Sonatide |  | 0 | 0 | 41,775
Less amounts received from Sonatide |  | 0 | 0 | (26,429)
Less amounts used to offset Due to Sonatide obligations (A) | [1] | 0 | 0 | (8,530)
Less impairment of due from affiliate |  | 0 | 0 | (400)
Write off of due from affiliate in connection with the acquisition |  | 0 | (49,011) | 0
Other |  | 0 | 0 | 972
Accounts Receivable, after Allowance for Credit Loss |  | $ 0 | $ 0 | $ 49,011
[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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