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Note 9 - Stock-based Compensation | 6 Months Ended
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Jun. 30, 2025
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 June 30, 2025, 938,914 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 June 30, |  | Six Months Ended June 30,
|  | 2025 |  | 2024 |  | 2025 |  | 2024
Restricted stock awards |  | $ | 17 |  |  | $ | 9 |  |  | $ | 26 |  |  | $ | 18 |
Total |  | $ | 17 |  |  | $ | 9 |  |  | $ | 26 |  |  | $ | 18 |
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, 2024 |  |  | 20,118 |  |  | $ | 5.22 |  |  | $ | 105 |
Granted |  |  | 16,156 |  |  |  | 6.50 |  |  |  | 105 |
Vested |  |  | — |  |  |  | — |  |  |  | — |
Canceled |  |  | — |  |  |  | — |  |  |  | — |
Balance as of June 30, 2025 |  |  | 36,274 |  |  | $ | 5.79 |  |  | $ | 210 |
As of June 30, 2025, there was $146 of total unrecognized compensation cost related to unvested shares granted. The cost is expected to be recognized over a weighted average period of 2.0 years.

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