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Note 2 - Acquisitions (Details Textual) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 05, 2023 USD ($) | Apr. 22, 2022 USD ($) $ / shares shares | Sep. 30, 2022 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) $ / shares shares | Jul. 03, 2023 | Dec. 31, 2021
Business Combination, Bargain Purchase, Gain Recognized, Amount |  |  |  | $ (0) | $ (0) | $ 1,300 |  |
Business Combination, Bargain Purchase, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  |  |  |  | Interest Income (Expense), Nonoperating |  |
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 |  |  |  | $ 0.001 |  |
Swire Pacific Offshore Holdings Ltd. [Member] |  |  |  |  |  |  |  |
Number of Vessels, Offshore Support |  | 50 |  | 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 | $ 8,800 |  |  |  |  |
Business Combination, Consideration Transferred, Total |  | 215,500 |  |  |  |  |  |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual |  |  |  |  |  | $ 149,700 |  |
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual |  |  |  |  |  | 14,800 |  |
Proceeds From Previous Acquisition, Post-closing Working Capital Refund, in Excess of Original Estimate |  |  | $ 8,000 |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  | $ 100 | $ 3,000 | $ 18,800 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  | 174,415 |  | $ 174,400 |  |  |  |
Property, Plant and Equipment, Original Lie of Asset (Year) |  |  |  | 20 years |  |  |  |
Goodwill, Ending Balance |  | $ 0 |  |  |  |  |  |
Swire Pacific Offshore Holdings Ltd. [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) |  |  |  | 1 year |  |  |  |
Swire Pacific Offshore Holdings Ltd. [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) |  |  |  | 16 years |  |  |  |
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 |  |  |  | 8,100,000 |  |
Sonatide [Member] |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  |  |  |  | $ 11,200 |  |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual |  |  |  |  |  | 2,300 |  |
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual |  |  |  |  |  | $ 800 |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage |  |  |  |  |  |  |  | 49.00%
Equity Method Investment, Ownership Percentage by Other Owners |  |  |  |  |  |  |  | 51.00%
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  | 51.00% |  |
Business Combination, Bargain Purchase, Gain Recognized, Amount |  |  |  |  |  | $ 1,300 |  |
Unsecured Debt [Member] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 10.375% | 10.375% |  | 10.375% |
Vessels From Solstad Offshore ASA [Member] |  |  |  |  |  |  |  |
Number of Platform Support Vessels | 37 |  |  |  |  |  |  |
Payments to Acquire Productive Assets | $ 594,200 |  |  |  |  |  |  |
Payments to Acquire Productive Assets, Gross, Before Adjustments | 577,000 |  |  |  |  |  |  |
Asset Acquisition, Provisional Information, Initial Accounting Incomplete, Adjustment, Purchase Price | 3,000 |  |  |  |  |  |  |
Asset Acquisition, Provisional Information, Initial Accounting Incomplete, Adjustment, Working Capital | 3,200 |  |  |  |  |  |  |
Asset Acquisition, Acquisition Related Costs | 11,000 |  |  |  |  |  |  |
Vessels From Solstad Offshore ASA [Member] | Lubricants [Member] |  |  |  |  |  |  |  |
Asset Acquisition, Provisional Information, Initial Accounting Incomplete, Adjustment, Working Capital | $ 1,300 |  |  |  |  |  |  |

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