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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
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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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- Definition The cash payments for pre-closing working capital adjusmtnets in a business combination. + References No definition available. + Details
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- Definition The number of offshore support vessels acquired in a business combination. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=126966197&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126975305&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126966197&loc=d3e6578-128477 + Details
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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21475-112644 + Details
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- Definition 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. + References No definition available. + Details
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