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Note 1 - Nature of Operations and Summary of Significant Accounting Policies (Details Textual) $ in Millions		12 Months Ended
	Apr. 22, 2022	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($) shares	Dec. 31, 2022 USD ($) shares	Jun. 30, 2022 USD ($)	Dec. 31, 2021 shares
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			217	191
Number Of Vessels Disposed				8
OCI, Debt Securities, Available-for-Sale, Transfer from Held-to-Maturity, Gain (Loss), before Adjustment and Tax			$ (0.3)	$ (0.5)
Wage and Sick Cost Refund, Amount			$ 6.1	5.3
Government Assistance, Amount				$ 1.3
Debt Security, Corporate, Non-US [Member]
Debt Instrument, Interest Rate, Stated Percentage					8.75%
PEMEX [Member]
Accounts Receivable, before Allowance for Credit Loss, Current					$ 8.6
Out-of-the-money Warrants [Member]
Class of Warrant or Right, Outstanding (in shares) | shares			861	5,923		5,923
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			215	178
Stacked Vessels [Member]
Number of Vessels			2	5
Remaining Number Of Vessels [Member]
Number of Vessels				183
Alucat Crew Boats [Member]
Number of Vessels			8
Alucat Crew Boats, Expected Cost, Each			$ 4.0
Alucat Crew Boats [Member] | Forecast [Member]
Number of Vessels		6
Alucat Crew Boats, Expected Cost, Each		$ 2.5
Down Payment To Start Construction On Crew Boats		$ 2.9
Alucat Crew Boats [Member] | West Africa [Member]
Number of Vessels			2
Alucat Crew Boats, Expected Cost, Each			$ 6.0
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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