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Note 7 - Affiliates Balances (Tables) | 6 Months Ended
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Jun. 30, 2021
Notes Tables |
Schedule of Related Party Transactions [Table Text Block] |
(In thousands) |  | June 30, 2021 |  |  | December 31, 2020 |
Due from affiliates: |  |  |  |  |  |  |  |
Angolan joint venture (Sonatide) |  | $ | 44,135 |  |  | $ | 41,623 |
Nigeria joint venture (DTDW) |  |  | 20,787 |  |  |  | 20,427 |
|  |  | 64,922 |  |  |  | 62,050 |
Due to affiliates: |  |  |  |  |  |  |  |
Sonatide |  | $ | 38,972 |  |  | $ | 32,767 |
DTDW |  |  | 20,787 |  |  |  | 20,427 |
|  |  | 59,759 |  |  |  | 53,194 |
Net due from affiliates |  | $ | 5,163 |  |  | $ | 8,856 |
Schedule of Amounts Due From Affiliate [Table Text Block] |
|  | Six Months |
|  | Ended |
(In thousands) |  | June 30, 2021 |
Due from Sonatide at December 31, 2020 |  | $ | 41,623 |
Revenue earned by the company through Sonatide |  |  | 17,187 |
Less amounts received from Sonatide |  |  | (14,632 | )
Other |  |  | (43 | )
Total due from Sonatide at June 30, 2021 |  | $ | 44,135 |
Schedule of Amoutns Due to Affiliate [Table Text Block] |
|  | Six Months |
|  | Ended |
(In thousands) |  | June 30, 2021 |
Due to Sonatide at December 31, 2020 |  | $ | 32,767 |
Plus additional commissions payable to Sonatide |  |  | 1,596 |
Plus amounts paid by Sonatide on behalf of the company |  |  | 4,331 |
Other |  |  | 278 |
Total due to Sonatide at June 30, 2021 |  | $ | 38,972 |
Equity Method Investments [Table Text Block] |
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, 2021 |  |  | June 30, 2020 |  |  | June 30, 2021 |  |  | June 30, 2020 |
Revenues of Angolan operations (in thousands) |  | $ | 9,075 |  |  | $ | 12,289 |  |  | $ | 18,367 |  |  | $ | 24,426 |
Percent of consolidated vessel revenues |  |  | 10 | % |  |  | 12 | % |  |  | 11 | % |  |  | 11 | %
Number of company owned vessels in Angola |  |  | 23 |  |  |  | 26 |  |  |  | 22 |  |  |  | 27 |
Number of stacked company owned vessels in Angola |  |  | 5 |  |  |  | 9 |  |  |  | 6 |  |  |  | 10 |

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