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Note 3 - Acquisition of Swire Pacific Offshore Holdings Ltd (Details Textual)
$ / shares in Units, $ in Thousands
3 Months Ended 5 Months Ended 9 Months Ended
Apr. 22, 2022
USD ($)
$ / shares
shares
Sep. 30, 2022
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2022
USD ($)
Warrans 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 $ 42,000      
Payments to Acquire Businesses, Preclosing Working Capital Adjustments, Net of Refunds 10,900      
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     $ 102,200  
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual     13,000  
Proceeds From Previous Acquisition, Post-closing Working Capital Refund, in Excess of Original Estimate       8,000
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment       (6,900)
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Prepaid Expenses and Other Current Assets       (1,100)
Business Combination, Acquisition Related Costs   $ 3,400   12,800
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment, Total $ 172,760 172,800 172,800 $ 172,800
Property, Plant and Equipment, Original Lie of Asset (Year)       20 years
Goodwill, Ending Balance   $ 0 $ 0 $ 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] | Warrans 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