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Note 6 - Stock-based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2025
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, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Stock options |  | $ | 190 |  |  | $ | 152 |  |  | $ | 378 |  |  | $ | 308 |
Restricted stock |  |  | 45 |  |  |  | 7 |  |  |  | 84 |  |  |  | 12 |
Total |  | $ | 235 |  |  | $ | 159 |  |  | $ | 462 |  |  | $ | 320 |
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, 2025 |  |  | 1,106,436 |  |  | $ | 7.15 |  |  |  |  |  |  |  |  |
Granted |  |  | - |  |  |  | - |  |  |  |  |  |  |  |  |
Exercised |  |  | (9,367 | ) |  |  | 6.52 |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (99,005 | ) |  | $ | 9.26 |  |  |  |  |  |  |  |  |
Outstanding at June 30, 2025 |  |  | 998,064 |  |  | $ | 6.95 |  |  |  | 4.34 |  |  | $ | 2,025 |
Vested and expected to vest at June 30, 2025 |  |  | 900,507 |  |  | $ | 6.94 |  |  |  | 4.20 |  |  | $ | 1,835 |
Exercisable at June 30, 2025 |  |  | 540,052 |  |  | $ | 6.77 |  |  |  | 3.09 |  |  | $ | 1,192 |

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