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Note 5 - Stock-based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2026
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, |
|  | 2026 |  |  | 2025 |  |  | 2026 |  |  | 2025 |
Stock options |  | $ | 77 |  |  | $ | 190 |  |  | $ | 155 |  |  | $ | 378 |
Restricted stock |  |  | 13 |  |  |  | 45 |  |  |  | (66 | ) |  |  | 84 |
Total |  | $ | 90 |  |  | $ | 235 |  |  | $ | 89 |  |  | $ | 462 |
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, 2026 |  |  | 967,351 |  |  | $ | 6.95 |  |  |  |  |  |  |  |  |
Granted |  |  | 5,000 |  |  | $ | 5.92 |  |  |  |  |  |  |  |  |
Exercised |  |  | (6,766 | ) |  | $ | 5.27 |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (20,140 | ) |  | $ | 7.19 |  |  |  |  |  |  |  |  |
Outstanding at June 30, 2026 |  |  | 945,445 |  |  | $ | 6.96 |  |  |  | 3.30 |  |  | $ | 199 |
Vested and expected to vest at June 30, 2026 |  |  | 892,666 |  |  | $ | 6.92 |  |  |  | 3.19 |  |  | $ | 198 |
Exercisable at June 30, 2026 |  |  | 726,427 |  |  | $ | 6.78 |  |  |  | 2.73 |  |  | $ | 197 |

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