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Note 9 - Stock-Based Compensation | 3 Months Ended
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Mar. 31, 2024
Notes to Financial Statements |
Share-Based Payment Arrangement [Text Block] | 9. Stock-Based Compensation Under the Company’s 2021 Incentive Plan (the "Plan"), and the prior 2011 Incentive Plan, as amended, stock-based compensation may be issued to employees and non-employee directors. As of March 31, 2024, 955,070 shares remained available for future issuance under the Plan. The following table summarizes stock-based compensation expense, which includes expenses related to awards granted under the Plan for the periods indicated:
|  | Three Months Ended March 31,
|  | 2024 |  | 2023
Restricted stock awards |  | $ | 9 |  |  | $ | — |
Total |  | $ | 9 |  |  | $ | — |
Restricted Stock Awards The following table summarizes restricted stock awards activity for the period indicated:
|  | Number of Shares |  | Weighted Average Grant Date Fair Value |  | Aggregate Grant Date Fair Value
Balance as of December 31, 2023 |  |  | 20,118 |  |  | $ | 5.22 |  |  | $ | 105 |
Granted |  |  | — |  |  |  | — |  |  |  | — |
Vested |  |  | — |  |  |  | — |  |  |  | — |
Canceled |  |  | — |  |  |  | — |  |  |  | — |
Balance as of March 31, 2024 |  |  | 20,118 |  |  | $ | 5.22 |  |  | $ | 105 |

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