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Note 7 - Affiliates Balances (Tables) | 9 Months Ended
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Sep. 30, 2021
Notes Tables |
Schedule of Related Party Transactions [Table Text Block] |
(In thousands) |  | September 30, 2021 |  |  | December 31, 2020 |
Due from affiliates: |  |  |  |  |  |  |  |
Angolan joint venture (Sonatide) |  | $ | 47,251 |  |  | $ | 41,623 |
Nigeria joint venture (DTDW) |  |  | 20,966 |  |  |  | 20,427 |
|  |  | 68,217 |  |  |  | 62,050 |
Due to affiliates: |  |  |  |  |  |  |  |
Sonatide |  | $ | 38,605 |  |  | $ | 32,767 |
DTDW |  |  | 20,966 |  |  |  | 20,427 |
|  |  | 59,571 |  |  |  | 53,194 |
Net due from affiliates |  | $ | 8,646 |  |  | $ | 8,856 |
Schedule of Amounts Due From Affiliate [Table Text Block] |
|  | Nine Months |
|  | Ended |
(In thousands) |  | September 30, 2021 |
Due from Sonatide at December 31, 2020 |  | $ | 41,623 |
Revenue earned by the company through Sonatide |  |  | 29,096 |
Less amounts received from Sonatide |  |  | (19,275 | )
Less amounts used to offset due to Sonatide obligations |  |  | (5,177 | )
Other |  |  | 984 |
Total due from Sonatide at September 30, 2021 |  | $ | 47,251 |
Schedule of Amoutns Due to Affiliate [Table Text Block] |
|  | Nine Months |
|  | Ended |
(In thousands) |  | September 30, 2021 |
Due to Sonatide at December 31, 2020 |  | $ | 32,767 |
Plus additional commissions payable to Sonatide |  |  | 2,659 |
Plus amounts paid by Sonatide on behalf of the company |  |  | 7,811 |
Less amounts used to offset due from Sonatide obligations |  |  | (5,177 | )
Other |  |  | 545 |
Total due to Sonatide at September 30, 2021 |  | $ | 38,605 |
Equity Method Investments [Table Text Block] |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, 2021 |  |  | September 30, 2020 |  |  | September 30, 2021 |  |  | September 30, 2020 |
Revenues of Angolan operations (in thousands) |  | $ | 12,046 |  |  | $ | 10,660 |  |  | $ | 30,413 |  |  | $ | 35,086 |
Percent of consolidated vessel revenues |  |  | 13 | % |  |  | 12 | % |  |  | 11 | % |  |  | 12 | %
Number of company owned vessels in Angola |  |  | 24 |  |  |  | 24 |  |  |  | 23 |  |  |  | 26 |
Number of stacked company owned vessels in Angola |  |  | 4 |  |  |  | 8 |  |  |  | 5 |  |  |  | 9 |

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