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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 |  |  |  |

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