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Note 7 - Stock Based Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2019
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) |  | 13,000 |  | 13,000 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested, Number of Shares (in shares) |  | 0 |  | 0 |
Share Price (in dollars per share) |  | $ 21.57 |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  | $ 1,700 |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  | 3 years 7 months 6 days |  |  |
Restricted Stock [Member] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) |  | 42,000 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  | 19,000 |  |  |
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) |  |  |  |  | 1,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Pursuant to Exercise of Incentive Stock Options (in shares) |  |  |  |  | 1,000,000
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) |  |  |  |  | 250,000
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) |  |  |  |  | 50,000
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) |  | 2,364 | 3,984 |  |
Stock Issued During Period, Value, Issued for Services |  | $ 52 | $ 69 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) |  | 1,970 | 3,320 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Month) |  | 3 months | 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) |  | 15,431 | 44,871 |  |
Stock Issued During Period, Value, Issued for Services |  | $ 304 | $ 764 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) |  |  | 41,066 |  |
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, Shares Issued in Period (in shares) |  | 5,000 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) |  | 9,272 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Month) |  | 3 months |  |  |
The 2019 Plan [Member] | Restricted Stock [Member] | Certain Key Employees [Member] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Month) |  | 4 years |  |  |
The 2019 Plan [Member] | Restricted Stock [Member] | Workforce for Services [Member] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares) |  |  | 28,735 |  |
Stock Issued During Period, Value, Issued for Services |  |  | $ 537 |  |
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) |  | 3,000 | 4,000 |  |
Shares Granted, Value, Share-Based Payment Arrangement, before Forfeiture |  | $ 54 | $ 76 |  |
Share Purchase Match Program [Member] | Restricted Stock [Member] | Board of Directors [Member] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares) |  | 394 | 664 |  |
Share Purchase Match Program [Member] | Restricted Stock [Member] | An Employee [Member] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  | 3,805 |  |
Share Purchase Match Program [Member] | Restricted Stock [Member] | Chief Executive Officer [Member] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares) |  | 1,159 |  |  |

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