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Note 6 - Stock-based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2025
Notes Tables |
Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block] |
|  | Three-month period ended |  |  | Nine-month period ended |
|  | September 30, |  |  | September 30, |  |  | September 30, |  |  | September 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Stock options |  | $ | 192 |  |  | $ | 164 |  |  | $ | 570 |  |  | $ | 472 |
Restricted stock |  |  | 44 |  |  |  | 6 |  |  |  | 128 |  |  |  | 18 |
Total |  | $ | 236 |  |  | $ | 170 |  |  | $ | 698 |  |  | $ | 490 |
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 |  |  | (15,982 | ) |  | $ | 6.10 |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (103,357 | ) |  | $ | 9.17 |  |  |  |  |  |  |  |  |
Outstanding at September 30, 2025 |  |  | 987,097 |  |  | $ | 6.96 |  |  |  | 4.06 |  |  | $ | 343 |
Vested and expected to vest at September 30, 2025 |  |  | 891,035 |  |  | $ | 6.95 |  |  |  | 3.91 |  |  | $ | 315 |
Exercisable at September 30, 2025 |  |  | 535,372 |  |  | $ | 6.78 |  |  |  | 2.81 |  |  | $ | 242 |

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