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Note 7 - Stock Based Compensation (Details Textual) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2019
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) |  | 13 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested, Number of Shares, Ending Balance (in shares) |  | 0 |  | 0 |
Share Price (in dollars per share) |  | $ 12.95 |  |  |
Restricted Stock [Member] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) |  | 13 |  |  |
The 2019 Plan [Member] | Share-Based Payment Arrangement, Option [Member] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) |  |  |  |  | 1,500
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Pursuant to Exercise of Incentive Stock Options (in shares) |  |  |  |  | 1,000
The 2019 Plan [Member] | Share-Based Payment Arrangement, Option [Member] | Employee or Consultant [Member] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) |  |  |  |  | 250
The 2019 Plan [Member] | Share-Based Payment Arrangement, Option [Member] | Non-employee Director [Member] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) |  |  |  |  | 50
The 2019 Plan [Member] | Restricted Stock [Member] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares) |  | 863 | 394 |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount |  | $ 1,300 |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  | 3 years 8 months 12 days |  |  |
The 2019 Plan [Member] | Restricted Stock [Member] | Board of Directors [Member] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares) |  | 5,174 | 2,364 |  |
Stock Issued During Period, Value, Issued for Services |  | $ 69 | $ 52 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) |  | 4,311 | 1,970 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Month) |  | 3 months |  |  |
The 2019 Plan [Member] | Restricted Stock [Member] | Chief Executive Officer [Member] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Month) |  |  | 3 months |  |
The 2019 Plan [Member] | Restricted Stock [Member] | An Employee [Member] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares) |  | 5,000 | 1,261 |  |
Stock Issued During Period, Value, Issued for Services |  | $ 79 | $ 20 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Month) |  | 4 years | 2 years |  |
Share Purchase Match Program [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Matching Percentage of Common Stock Purchased | 20.00% |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Matching of Common Stock Purchased per Individual Within a Calendar Year | $ 25 |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares) |  | 863 | 1,655 |  |
Shares Granted, Value, Share-Based Payment Arrangement, before Forfeiture |  | $ 12 | $ 29 |  |

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