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Note 7 - Affiliates Balances (Details Textual) $ in Thousands, Kz in Millions			3 Months Ended		6 Months Ended		12 Months Ended
	Apr. 22, 2021 USD ($)	Jun. 22, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2020	Jun. 30, 2021 AOA (Kz)	Apr. 21, 2021 USD ($)
Accounts Receivable, Credit Loss Expense (Reversal)			$ (1,000)	$ 53,581	$ (1,000)	$ 53,581
Number of Vessels					145		149
Repayments of Secured Debt					$ 37,901	$ 4,742
Sonatide Marine Ltd [Member]
Proceeds from Dividends Received		$ 17,200
Accounts Receivable, Credit Loss Expense (Reversal)				41,500
Sonatide [Member]
Accounts Receivable, Credit Loss Expense (Reversal)			(1,000)
Due From Affiliate, Net of Due to Affiliate			5,200		5,200
Cash, Ending Balance			9,600		9,600			Kz 0.4
Accounts Receivable, after Allowance for Credit Loss, Current, Total			$ 6,800		$ 6,800
DTDW [Member]
Accounts Receivable, Credit Loss Expense (Reversal)				12,100
Equity Method Investment, Ownership Percentage			40.00%		40.00%			40.00%
Equity Method Investment, Ownership Percentage by Other Owners			60.00%		60.00%			60.00%
Number of Vessels					1
Secured Long-term Debt, Noncurrent									$ 4,700
Repayments of Secured Debt	$ 2,000
Sonatide Marine Ltd [Member]
Dividends, Total				$ 35,000
Sonangol [Member] | Sonatide Marine Ltd [Member]
Proceeds from Dividends Received		$ 17,800

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