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Note 7 - Affiliates Balances - Company Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues of Angolan operations (in thousands)	$ 89,953	$ 102,344	$ 173,457	$ 218,712
Sonatide [Member] | ANGOLA
Revenues of Angolan operations (in thousands)	$ 9,075	$ 12,289	$ 18,367	$ 24,426
Percent of consolidated vessel revenues	10.00%	12.00%	11.00%	11.00%
Number of company owned vessels in Angola	23	26	22	27
Number of stacked company owned vessels in Angola	5	9	6	10

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