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Note 5 - Investment in Unconsolidated Affiliates - Related Party Transaction (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Angolan joint venture (Sonatide)	$ 62,050	$ 125,972
Sonatide	53,194	50,186
Due from affiliates, net of due to affiliates	8,856	75,786
Sonatide Marine Ltd [Member] | ANGOLA
Angolan joint venture (Sonatide)	41,623	89,246
Sonatide	32,767	31,475
DTDW [Member] | NIGERIA
Angolan joint venture (Sonatide)	20,427	36,726
Sonatide	$ 20,427	$ 18,711

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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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- Definition

Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).

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Receivables to be collected from (obligations owed to) related parties, net as of the balance sheet date within one year 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.

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