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