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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 |  |  |

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