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Note 3 - Acquisitions of Swire Pacific Offshore Holdings LTD (Details Textual) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Apr. 22, 2022 USD ($) $ / shares shares | Jun. 30, 2023 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2022 USD ($) | Mar. 31, 2023 USD ($)
Business Combination, Acquisition Related Costs |  | $ 100 | $ 7,200 | $ 800 | $ 9,400 |
Warrants Issued to Acquire Swire Pacific Offshore Holdings Ltd. [Member] |  |  |  |  |  |
Class of Warrant or Right, Issued During Period, Exercise Price (in dollars per share) | $ / shares | $ 0.001 |  |  |  |  |
Swire Pacific Offshore Holdings Ltd. [Member] |  |  |  |  |  |
Number of Vessels, Offshore Support | 50 |  |  |  |  |
Payments to Acquire Businesses, Gross | $ 42,000 |  |  |  |  |
Payments to Acquire Businesses, Preclosing Working Capital Adjustments | 19,600 |  |  |  |  |
Proceeds From Previous Acquisition, Post-closing Working Capital Refund | 8,800 |  |  |  |  |
Business Combination, Consideration Transferred, Total | $ 215,500 |  |  |  |  |
Goodwill, Ending Balance |  |  |  |  |  | $ 0
Swire Pacific Offshore Holdings Ltd. [Member] | Warrants Issued to Acquire Swire Pacific Offshore Holdings Ltd. [Member] |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) | shares | 8,100,000 |  |  |  |  |

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