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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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