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Note 4 - Investment in Unconsolidated Affiliates (Tables) | 12 Months Ended
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Dec. 31, 2021
Notes Tables |
Schedule of Related Party Transactions [Table Text Block] |
(In Thousands) |  | December 31, |  |  | December 31, |
|  | 2021 |  |  | 2020 |
Due from affiliates: |  |  |  |  |  |  |  |
Angolan joint venture (Sonatide) |  | $ | 49,011 |  |  | $ | 41,623 |
Nigerian joint venture (DTDW) |  |  | 21,123 |  |  |  | 20,427 |
|  |  | 70,134 |  |  |  | 62,050 |
Due to affiliates: |  |  |  |  |  |  |  |
Sonatide |  | $ | 40,432 |  |  | $ | 32,767 |
DTDW |  |  | 21,123 |  |  |  | 20,427 |
|  |  | 61,555 |  |  |  | 53,194 |
Due from affiliates, net of due to affiliates |  | $ | 8,579 |  |  | $ | 8,856 |
Schedule of Amounts Due From Affiliate [Table Text Block] |
(In Thousands) |  | Year Ended December 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Due from Sonatide at beginning of year |  | $ | 41,623 |  |  | $ | 89,246 |  |  | $ | 109,176 |
Revenue earned by the company through Sonatide |  |  | 41,775 |  |  |  | 44,254 |  |  |  | 52,372 |
Less amounts received from Sonatide |  |  | (26,429 | ) |  |  | (36,160 | ) |  |  | (60,486 | )
Less amounts used to offset Due to Sonatide obligations (A) |  |  | (8,530 | ) |  |  | (11,848 | ) |  |  | (10,551 | )
Less impairment of due from affiliate |  |  | (400 | ) |  |  | (40,900 | ) |  |  | — |
Other |  |  | 972 |  |  |  | (2,969 | ) |  |  | (1,265 | )
|  | $ | 49,011 |  |  | $ | 41,623 |  |  | $ | 89,246 |
Schedule of Amoutns Due to Affiliate [Table Text Block] |
(In Thousands) |  | Year Ended December 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Due to Sonatide at beginning of year |  | $ | 32,767 |  |  | $ | 31,475 |  |  | $ | 29,347 |
Plus commissions payable to Sonatide |  |  | 3,832 |  |  |  | 4,152 |  |  |  | 4,937 |
Plus amounts paid by Sonatide on behalf of the company |  |  | 10,914 |  |  |  | 9,037 |  |  |  | 9,654 |
Less commissions paid to Sonatide |  |  | — |  |  |  | — |  |  |  | (5,961 | )
Less amounts used to offset Due from Sonatide obligations (A) |  |  | (8,530 | ) |  |  | (11,848 | ) |  |  | (10,551 | )
Other |  |  | 1,449 |  |  |  | (49 | ) |  |  | 4,049 |
|  | $ | 40,432 |  |  | $ | 32,767 |  |  | $ | 31,475 |

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