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Note 5 - Stock-based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2024
Notes Tables |
Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block] |
|  | Three-month period ended |  |  | Six-month period ended |
|  | June 30, |  |  | June 30, |  |  | June 30, |  |  | June 30, |
|  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
Stock options |  | $ | 152 |  |  | $ | 153 |  |  | $ | 308 |  |  | $ | 291 |
Restricted stock |  |  | 7 |  |  |  | 1 |  |  |  | 12 |  |  |  | 2 |
Total |  | $ | 159 |  |  | $ | 154 |  |  | $ | 320 |  |  | $ | 293 |
Share-Based Payment Arrangement, Option, Activity [Table Text Block] |
|  | Number of Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term (years) |  |  | Aggregate Intrinsic Value |
Outstanding at January 1, 2024 |  |  | 1,250,595 |  |  | $ | 7.10 |  |  |  |  |  |  |  |  |
Granted |  |  | 3,460 |  |  |  | 6.84 |  |  |  |  |  |  |  |  |
Exercised |  |  | (288,675 | ) |  |  | 7.10 |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (91,482 | ) |  | $ | 8.79 |  |  |  |  |  |  |  |  |
Outstanding at June 30, 2024 |  |  | 873,898 |  |  | $ | 6.92 |  |  |  | 4.34 |  |  | $ | 3,231 |
Vested and expected to vest at June 30, 2024 |  |  | 775,281 |  |  | $ | 7.00 |  |  |  | 4.18 |  |  | $ | 2,805 |
Exercisable at June 30, 2024 |  |  | 417,867 |  |  | $ | 7.56 |  |  |  | 2.87 |  |  | $ | 1,277 |

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