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v3.22.4

Note 1 - Nature of Operations and Summary of Significant Accounting Policies (Details Textual) $ in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 22, 2022 | Dec. 31, 2022 USD ($) shares | Dec. 31, 2022 USD ($) shares | Dec. 31, 2021 | Jan. 01, 2020 USD ($)
Highly Liquid Investments Maturity Period (Year) |  |  | 3 years |  |
Inspection Interval (Year) |  |  | 5 years |  |
Increase Of Amortization Period (Month) |  |  | 30 months |  |
Number Of Offshore Supply Vessels |  |  | 191 | 153 |
Number Of Vessels Disposed |  |  | 8 | 18 |
Alucat Crew Boats, Expected Cost, Each |  |  | $ 3.5 |  |
Down Payment To Start Construction On Crew Boats |  |  | $ 1.2 |  |
Number of Ocean Going Tugs, Contracted To Build |  | 2 | 2 |  |
Ocean Going Tugs, Expected Cost, Each |  | $ 6.3 |  |  |
Down Payments To Start Construction On Tugboats |  | $ 2.3 |  |  |
OCI, Debt Securities, Available-for-Sale, Transfer from Held-to-Maturity, Gain (Loss), before Adjustment and Tax |  |  | $ (0.5) |  |
Government Assistance, Amount |  |  | 1.3 |  |
Wage and Sick Cost Refund, Amount |  |  | $ 5.3 |  |
Accounting Standards Update 2016-13 [Member] |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss, Ending Balance |  |  |  |  | $ 0.2
Debt Security, Corporate, Non-US [Member] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 8.75% | 8.75% |  |
PEMEX [Member] |  |  |  |  |
Accounts Receivable, before Allowance for Credit Loss, Current |  | $ 8.6 | $ 8.6 |  |
Out-of-the-money Warrants [Member] |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) | shares |  | 5,923,399 | 5,923,399 |  |
Marine Equipment [Member] |  |  |  |  |
Property, Plant and Equipment, Salvage Value, Percentage |  | 7.50% | 7.50% |  |
Marine Equipment [Member] | Minimum [Member] |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) |  |  | 10 years |  |
Marine Equipment [Member] | Maximum [Member] |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) |  |  | 20 years |  |
Property, Plant and Equipment, Other Types [Member] | Minimum [Member] |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) |  |  | 3 years |  |
Property, Plant and Equipment, Other Types [Member] | Maximum [Member] |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) |  |  | 10 years |  |
Remaining Number Of Vessels [Member] |  |  |  |  |
Number of Vessels |  |  | 183 | 135 |
Actively Employed Vessels [Member] |  |  |  |  |
Number of Vessels |  |  | 178 | 126 |
Stacked Vessels [Member] |  |  |  |  |
Number of Vessels |  |  | 5 | 9 |
Alucat Crew Boats [Member] |  |  |  |  |
Number of Vessels |  |  | 2 |  |
Swire Pacific Offshore Holdings Ltd. [Member] |  |  |  |  |
Number of Vessels, Offshore Support | 50 |  | 50 |  |
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 |  |

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