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Note 4 - Debt - Summary of Debt Outstanding (Details) (Parentheticals) | Dec. 31, 2023 | Jul. 03, 2023 | Dec. 31, 2022 | Nov. 16, 2021 | Jul. 31, 2017
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The 8.00% Senior Secured Notes due August 2022 [Member] |  |  |  |  |
Interest rate | 8.50% |  | 8.50% | 8.00% | 8.00%
Unsecured Debt [Member] |  |  |  |  |
Interest rate | 10.375% | 10.375% |  |  |

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