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Note 4 - Indebtedness - Summary of Debt Outstanding (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Long-term debt, gross | $ 197,975 | $ 297,659
Debt premium and discount, net | (5,244) | (8,725)
Less: Current portion of long-term debt | (27,797) | (9,890)
Total long-term debt | 164,934 | 279,044
The 8.00% Senior Secured Notes due August 2022 [Member] |  |
Long-term debt, gross | 147,049 | 224,793
NOK Denominated Notes Due May 2024 [Member] | Troms Offshore [Member] |  |
Long-term debt, gross | 5,954 | 10,260
NOK Denominated Notes Due January 2026 [Member] | Troms Offshore [Member] |  |
Long-term debt, gross | 14,559 | 20,788
USD Denominated Notes Due January 2027 [Member] | Troms Offshore [Member] |  |
Long-term debt, gross | 14,744 | 20,273
USD Denominated Notes Due April 2027 [Member] | Troms Offshore [Member] |  |
Long-term debt, gross | $ 15,669 | $ 21,545

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