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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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- Definition

The aggregate amount of receivables to be collected from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth, at the financial statement date. which are usually due within one year (or one business cycle).

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