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Note 7 - Affiliates Balances (Tables) | 9 Months Ended
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Sep. 30, 2020
Notes Tables |
Schedule of Related Party Transactions [Table Text Block] |
(In thousands) |  | September 30, 2020 |  |  | December 31, 2019 |
Due from affiliates: |  |  |  |  |  |  |  |
Sonatide (Angola) |  | $ | 45,627 |  |  | $ | 89,246 |
DTDW (Nigeria) |  |  | 20,065 |  |  |  | 36,726 |
|  |  | 65,692 |  |  |  | 125,972 |
Due to affiliates: |  |  |  |  |  |  |  |
Sonatide (Angola) |  | $ | 33,290 |  |  | $ | 31,475 |
DTDW (Nigeria) |  |  | 20,065 |  |  |  | 18,711 |
|  |  | 53,355 |  |  |  | 50,186 |
Net due from affiliates |  | $ | 12,337 |  |  | $ | 75,786 |
Schedule of Amounts Due From Affiliate [Table Text Block] |
|  | Nine Months |
|  | Ended |
(In thousands) |  | September 30, 2020 |
Due from Sonatide at December 31, 2019 |  | $ | 89,246 |
Revenue earned by the company through Sonatide |  |  | 34,378 |
Less amounts received from Sonatide |  |  | (27,761 | )
Less amounts used to offset due to Sonatide obligations (A) |  |  | (8,145 | )
Affiliate credit loss impairment expense |  |  | (41,500 | )
Other |  |  | (591 | )
Total due from Sonatide at September 30, 2020 |  | $ | 45,627 |
Schedule of Amoutns Due to Affiliate [Table Text Block] |
|  | Nine Months |
|  | Ended |
(In thousands) |  | September 30, 2020 |
Due to Sonatide at December 31, 2019 |  | $ | 31,475 |
Plus additional commissions payable to Sonatide |  |  | 3,240 |
Plus amounts paid by Sonatide on behalf of the company |  |  | 6,763 |
Less amounts used to offset due from Sonatide obligations (A) |  |  | (8,145 | )
Other |  |  | (43 | )
Total due to Sonatide at September 30, 2020 |  | $ | 33,290 |
Equity Method Investments [Table Text Block] |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, 2020 |  |  | September 30, 2019 |  |  | September 30, 2020 |  |  | September 30, 2019 |
Revenues of Angolan operations (in thousands) |  | $ | 10,660 |  |  | $ | 11,534 |  |  | $ | 35,086 |  |  | $ | 41,194 |
Percent of consolidated vessel revenues |  |  | 12 | % |  |  | 10 | % |  |  | 12 | % |  |  | 11 | %
Number of company owned vessels in Angola |  |  | 24 |  |  |  | 31 |  |  |  | 26 |  |  |  | 33 |
Number of stacked company owned vessels in Angola |  |  | 8 |  |  |  | 14 |  |  |  | 9 |  |  |  | 14 |

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