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Note 15 - Subsequent Event (Details Textual) - Subsequent Event [Member] - Swire Pacific Offshore Holdings Ltd. [Member] $ / shares in Units, $ in Millions	Apr. 22, 2022 USD ($) $ / shares shares
Business Combination, Offshore Support Vessels Acquired	50
Business Combination, Consideration Transferred, Total | $	$ 42.0
Class Of Warrant Or Right, Issued During Period (in shares) | shares	8,100,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares	$ 0.001
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) | shares	1
Business Combination, Consideration Transferred, Cash Related to Pre-closing Working Capital Adjustments | $	$ 19.6

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The cash payments for pre-closing working capital adjusmtnets in a business combination.

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The number of offshore support vessels acquired in a business combination.

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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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Exercise price per share or per unit of warrants or rights outstanding.

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Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares.

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