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Note 5 - Investment in Unconsolidated Affiliates - Company Operations Due from Affiliates (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Less impairment of due from affiliate $ (52,981) $ 0 $ 0
Due to Sonatide at beginning of year 31,475 29,347 99,448
Plus commissions payable to Sonatide 4,152 4,937 5,502
Plus amounts paid by Sonatide on behalf of the company 9,037 9,654 14,778
Less commissions paid to Sonatide 0 (5,961) (13,906)
Less amounts used to offset Due from Sonatide obligations (A) [1] (11,848) (10,551) (78,993)
Other (49) 4,049 2,518
Due to Affiliate 32,767 31,475 29,347
Sonatide Marine Ltd [Member]      
Due from Sonatide at beginning of year 89,246 109,176 230,315
Revenue earned by the company through Sonatide 44,254 52,372 56,916
Less amounts received from Sonatide (36,160) (60,486) (76,878)
Less amounts used to offset Due to Sonatide obligations (A) [1] (11,848) (10,551) (78,993)
Less impairment of due from affiliate (40,900) 0 (20,083)
Other (2,969) (1,265) (2,101)
Due from Affiliates $ 41,623 $ 89,246 $ 109,176
[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.