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Note 7 - Affiliates Balances (Details Textual) $ in Thousands, Kz in Millions		3 Months Ended		12 Months Ended
	Apr. 22, 2021 USD ($)	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2020	Mar. 31, 2021 AOA (Kz)
Number of Vessels		146		149
Repayments of Secured Debt		$ 26,414	$ 2,600
Sonatide [Member]
Due From Affiliate, Net of Due to Affiliate		6,100
Cash, Ending Balance		9,500			Kz 1
Accounts Receivable, after Allowance for Credit Loss, Current, Total		$ 9,200
DTDW [Member]
Equity Method Investment, Ownership Percentage		40.00%			40.00%
Equity Method Investment, Ownership Percentage by Other Owners		60.00%			60.00%
Number of Vessels		1
Secured Long-term Debt, Noncurrent		$ 4,700
DTDW [Member] | Subsequent Event [Member]
Repayments of Secured Debt	$ 2,000

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- Definition

The amount due from affiliate net the offsetting amount due to affiliate.

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Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

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The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.

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Carrying amount of collateralized debt obligations with maturities initially due after one year or beyond the operating cycle, if longer, excluding the current portion. Obligations include, but not limited to, mortgage loans, chattel loans, and other borrowings secured by assets.

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