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Note 3 - Debt - Summary of Debt Outstanding (Details) (Parentheticals)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Nov. 16, 2021	Jul. 31, 2017
The 8.00% Senior Secured Notes due August 2022 [Member]
Interest rate		8.00%	8.00%	8.00%
Maturity date		Aug. 31, 2022
Troms Offshore [Member] | NOK Denominated Notes Due January 2026 [Member]
Interest rate	8.50%
Maturity date	Nov. 30, 2026
Troms Offshore [Member] | NOK Denominated Notes Due May 2024 [Member]
Maturity date, start		May 31, 2024
Maturity date, end		Jan. 31, 2026
Troms Offshore [Member] | USD Denominated Notes Due January 2027 [Member]
Maturity date, start		Jan. 31, 2027
Maturity date, end		Apr. 30, 2027

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Contractual interest rate for funds borrowed, under the debt agreement.

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