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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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The amount of acquisition related costs for asset acquisition.

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The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets, gross, before adjustments.

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Cash inflow representing an adjustment to the purchase price of a previous acquisition due to post-closing working capital refunds.

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Number of shares of equity interests issued or issuable to acquire entity.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Contractual interest rate for funds borrowed, under the debt agreement.

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