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Note 3 - Acquisitions (Details Textual) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 05, 2023 USD ($) | Apr. 22, 2022 USD ($) $ / shares shares | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Dec. 31, 2022
Business Combination, Acquisition Related Costs |  |  | $ 0.6 | $ 3.4 | $ 1.4 | $ 12.8 |
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 |  | $ 42.0 |  |  |  |  |
Payments to Acquire Businesses, Preclosing Working Capital Adjustments |  | 19.6 |  |  |  |  |
Proceeds From Previous Acquisition, Post-closing Working Capital Refund |  | 8.8 |  |  |  |  |
Business Combination, Consideration Transferred, Total |  | $ 215.5 |  |  |  |  |
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 |  |  |  |  |
Unsecured Debt [Member] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 10.375% |  | 10.375% |  | 10.375% |  | 10.375%
Vessels From Solstad Offshore ASA [Member] |  |  |  |  |  |  |
Number of Platform Support Vessels | 37 |  |  |  |  |  |
Payments to Acquire Productive Assets | $ 594.2 |  |  |  |  |  |
Payments to Acquire Productive Assets, Gross, Before Adjustments | 577.0 |  |  |  |  |  |
Asset Acquisition, Provisional Information, Initial Accounting Incomplete, Adjustment, Purchase Price | 3.0 |  |  |  |  |  |
Asset Acquisition, Provisional Information, Initial Accounting Incomplete, Adjustment, Working Capital | 3.2 |  |  |  |  |  |
Asset Acquisition, Acquisition Related Costs | 11.0 |  |  |  |  |  |
Vessels From Solstad Offshore ASA [Member] | Lubricants [Member] |  |  |  |  |  |  |
Asset Acquisition, Provisional Information, Initial Accounting Incomplete, Adjustment, Working Capital | $ 1.3 |  |  |  |  |  |

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