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Note 7 - Affiliates Balances (Details Textual) $ in Thousands		3 Months Ended			12 Months Ended
	Jan. 01, 2022 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2021	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)	Jan. 31, 2022
Business Combination, Bargain Purchase, Gain Recognized, Amount		$ 1,300		$ (0)
Number of Vessels		138	135
DTDW [Member]
Equity Method Investment, Ownership Percentage		40.00%
Equity Method Investment, Ownership Percentage by Other Owners		60.00%
Number of Vessels		1
Sonatide [Member]
Business Acquisition, Percentage of Voting Interests Acquired	51.00%
Payments to Acquire Businesses, Gross	$ 11,200
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual	1,000
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual		$ 100
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage						49.00%
Business Combination, Bargain Purchase, Gain Recognized, Amount	$ 1,300
Business Acquisition, Pro Forma Revenue					$ 375,400
Business Acquisition, Pro Forma Net Income (Loss)					$ 129,200
Sonatide [Member] | Interest Income and Other, Net [Member]
Business Combination, Bargain Purchase, Gain Recognized, Amount		$ 1,300

X

- Definition

The percentage of ownership of common stock or equity participation in the investee by other owners accounted for under the equity method of accounting.

+ References

No definition available.

+ Details

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X

- Definition

The number of vessels.

+ References

No definition available.

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X

- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

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- Definition

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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X

- Definition

The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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- Definition

In a business combination in which the amount of net identifiable assets acquired and liabilities assumed exceeds the aggregate consideration transferred or to be transferred (as defined), this element represents the amount of gain recognized by the entity.

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X

- Definition

This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

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- Definition

This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

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- Definition

Percentage of equity in the acquiree held by the acquirer immediately before the acquisition date in a business combination.

+ References

No definition available.

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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