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Note 1 - Nature of Operations and Summary of Significant Accounting Policies (Details Textual) $ in Thousands, € in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 22, 2022 | Jan. 31, 2025 USD ($) | Dec. 31, 2025 | Dec. 31, 2025 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Jan. 31, 2025 EUR (€) | Jun. 30, 2022 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 |  |  |  |  | 211 | 217 |  |
OCI, Debt Securities, Available-for-Sale, Transfer from Held-to-Maturity, Gain (Loss), before Adjustment and Tax |  |  |  |  | $ (0) | $ (300) |  |
Wage and Sick Cost Refund, Amount |  |  |  |  | 11,800 | $ 6,100 |  |
Debt Security, Corporate, Non-US [Member] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  | 8.75%
PEMEX [Member] |  |  |  |  |  |  |  |
Accounts Receivable, before Allowance for Credit Loss, Current |  |  |  |  | 700 |  |  | $ 8,600
Debt Securities, Available-for-Sale, Sold at Par Value |  |  |  |  | $ 8,000 |  |  |
Marine Equipment [Member] |  |  |  |  |  |  |  |
Property, Plant and Equipment, Salvage Value, Percentage |  |  |  |  | 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 |  |  |
Actively Employed Vessels [Member] |  |  |  |  |  |  |  |
Number of Vessels |  |  |  |  | 210 | 215 |  |
Stacked Vessels [Member] |  |  |  |  |  |  |  |
Number of Vessels |  |  |  |  | 1 | 2 |  |
Alucat Crew Boats [Member] |  |  |  |  |  |  |  |
Number of Vessels |  |  |  |  | 8 |  |  |
Alucat Crew Boats, Expected Cost, Each |  |  |  |  | $ 4,000 |  |  |
Alucat Crew Boats [Member] | Forecast [Member] |  |  |  |  |  |  |  |
Number of Vessels |  | 5 | 1 | 6 |  |  |  |
Alucat Crew Boats, Expected Cost, Each |  |  |  | $ 2,500 |  |  |  |
Down Payment To Start Construction On Crew Boats |  |  |  | $ 2,900 |  |  |  |
Alucat Crew Boats [Member] | Forecast [Member] | Supplier Facility Agreements for Five Vessels Delivered [Member] |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 9,700 |  |  |  |  | € 9.4 |
Alucat Crew Boats [Member] | West Africa [Member] |  |  |  |  |  |  |  |
Number of Vessels |  |  |  |  | 2 |  |  |
Alucat Crew Boats, Expected Cost, Each |  |  |  |  | $ 6,000 |  |  |
Solstad Offshore ASA [Member] |  |  |  |  |  |  |  |
Number of Vessels, Offshore Support |  |  |  |  | 37 |  |  |
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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