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Note 4 - Indebtedness - Summary of Debt Outstanding (Details) (Parentheticals) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
The 8.00% Senior Secured Notes due August 2022 [Member] |  |
Interest rate | 8.00% | 8.00%
Maturity date | Aug. 31, 2022 | Aug. 31, 2022
NOK Denominated Notes Due May 2024 [Member] | Troms Offshore [Member] |  |
Maturity date | May 31, 2024 | May 31, 2024
NOK Denominated Notes Due January 2026 [Member] | Troms Offshore [Member] |  |
Maturity date | Jan. 31, 2026 | Jan. 31, 2026
USD Denominated Notes Due January 2027 [Member] | Troms Offshore [Member] |  |
Maturity date | Jan. 31, 2027 | Jan. 31, 2027
USD Denominated Notes Due April 2027 [Member] | Troms Offshore [Member] |  |
Maturity date | Apr. 30, 2027 | Apr. 30, 2027

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