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Note 4 - Indebtedness - Schedule of Debt (Details) - Troms Offshore [Member] kr in Thousands, $ in Thousands | Dec. 31, 2020 USD ($) | Dec. 31, 2020 NOK (kr) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 NOK (kr)
--- | --- | --- | --- | ---
NOK Denominated Notes Due May 2024 [Member] |  |  |  |
Amount outstanding | $ 5,954 | kr 51,120 | $ 10,260 | kr 89,460
NOK Denominated Notes Due May 2024 [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair value in U.S. dollar equivalent (Level 2) | 5,954 |  | 10,259 |
NOK Denominated Notes Due January 2026 [Member] |  |  |  |
Amount outstanding | 14,559 | kr 125,000 | 20,788 | kr 181,250
NOK Denominated Notes Due January 2026 [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair value in U.S. dollar equivalent (Level 2) | 14,789 |  | 20,792 |
USD Denominated Notes Due January 2027 [Member] |  |  |  |
Amount outstanding | 14,744 |  | 20,273 |
USD Denominated Notes Due January 2027 [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair value in U.S. dollar equivalent (Level 2) | 15,040 |  | 20,278 |
USD Denominated Notes Due April 2027 [Member] |  |  |  |
Amount outstanding | 15,669 |  | 21,545 |
USD Denominated Notes Due April 2027 [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair value in U.S. dollar equivalent (Level 2) | $ 15,775 |  | $ 21,546 |

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