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Note 4 - Investment in Unconsolidated Affiliates - Related Party Transaction (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Angolan joint venture (Sonatide) | $ 70,134 | $ 62,050
Sonatide | 61,555 | 53,194
Due from affiliates, net of due to affiliates | 8,579 | 8,856
Sonatide Marine Ltd [Member] | ANGOLA |  |
Angolan joint venture (Sonatide) | 49,011 | 41,623
Sonatide | 40,432 | 32,767
DTDW [Member] | NIGERIA |  |
Angolan joint venture (Sonatide) | 21,123 | 20,427
Sonatide | $ 21,123 | $ 20,427

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