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Note 10 - 2020 Cash Incentive Bonus Plan (Details Textual) - Cash Incentive Bonus Plan [Member] $ in Thousands |  | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 16, 2023 USD ($) | Nov. 07, 2023 USD ($) | Sep. 30, 2023 USD ($) | Dec. 31, 2021 USD ($) | Oct. 31, 2020 USD ($)
Cash Bonus Incentive, Incremental Amounts | 14 |  |  | 11 |
Performance Plan, Minimum Number of Days Valuation Milestone Must be Achieved and Maintained (Day) | 20 days |  |  |  |
Percentage Valuation Milestone Cash Bonus Award Subject to Approval and Adjustment | 67.00% |  |  |  |
Cash Incentive Bonus Award |  |  |  |  | $ 6,500
Share-Based Payment Arrangement, Expense, after Tax |  |  | $ 0 |  |
Subsequent Event [Member] |  |  |  |  |
Payments for Cash Incentive Bonus |  | $ 0 |  |  |
Minimum [Member] |  |  |  |  |
Performance Plan, Valuation Milestone Amount | $ 200,000 |  |  | $ 74,900 |
Cash Incentive Bonus Award, Exceeds Maximum | 111,400 |  |  |  |
Maximum [Member] |  |  |  |  |
Performance Plan, Valuation Milestone Amount | 5,000,000 |  |  | $ 202,300 |
Cash Incentive Bonus Award, Exceeds Maximum | $ 289,700 |  |  |  |

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