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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.