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Note 15 - Subsequent Event (Details Textual) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2022 USD ($) | Jun. 30, 2022 USD ($) $ / shares shares | Dec. 31, 2017 shares
Class Of Warrant Or Right, Issued During Period (in shares) | shares |  |  | 11,543,814
Forecast [Member] | Warrans Issued to Acquire Swire Pacific Offshore Holdings Ltd. [Member] |  |  |
Class Of Warrant Or Right, Issued During Period (in shares) | shares |  | 8,100,000 |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  | $ 0.001 |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) | shares |  | 1 |
Sonatide [Member] | Subsequent Event [Member] |  |  |
Business Acquisition, Percentage of Voting Interests Acquired | 51.00% |  |
Payments to Acquire Businesses, Gross | $ | $ 11,200 |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage | 49.00% |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value | $ | $ 0 |  |
Swire Pacific Offshore Holdings Ltd. [Member] | Forecast [Member] |  |  |
Business Combination, Offshore Support Vessels Acquired |  | 50 |
Business Combination, Consideration Transferred, Total | $ |  | $ 42,000 |

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