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Note 7 - Affiliates Balances - Company Operations (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Revenues of Angolan operations (in thousands) | $ 83,504 | $ 116,368
Sonatide [Member] | ANGOLA |  |
Revenues of Angolan operations (in thousands) | $ 9,292 | $ 12,137
Percent of consolidated vessel revenues | 11.00% | 11.00%
Number of company owned vessels in Angola | 22 | 28
Number of stacked company owned vessels in Angola | 6 | 11

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