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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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