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Note 15 - Subsequent Event (Details Textual) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
	Jan. 31, 2022 USD ($)	Jun. 30, 2022 USD ($) $ / shares shares	Dec. 31, 2017 shares
Class Of Warrant Or Right, Issued During Period (in shares) | shares			11,543,814
Forecast [Member] | Warrans Issued to Acquire Swire Pacific Offshore Holdings Ltd. [Member]
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
Sonatide [Member] | Subsequent Event [Member]
Business Acquisition, Percentage of Voting Interests Acquired	51.00%
Payments to Acquire Businesses, Gross | $	$ 11,200
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage	49.00%
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value | $	$ 0
Swire Pacific Offshore Holdings Ltd. [Member] | Forecast [Member]
Business Combination, Offshore Support Vessels Acquired		50
Business Combination, Consideration Transferred, Total | $		$ 42,000

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