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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.

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