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Note 6 - Stock-based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2025
Notes Tables |
Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block] |
|  | Three-month period ended |
|  | March 31, |  |  | March 31, |
|  | 2025 |  |  | 2024 |
Stock options |  | $ | 188 |  |  | $ | 156 |
Restricted stock grants |  |  | 39 |  |  |  | 5 |
Total |  | $ | 227 |  |  | $ | 161 |
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 |  |  | - |  |  |  | - |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (13,015 | ) |  | $ | 7.11 |  |  |  |  |  |  |  |  |
Outstanding at March 31, 2025 |  |  | 1,093,421 |  |  | $ | 7.15 |  |  |  | 4.26 |  |  | $ | 25 |
Vested and expected to vest at March 31, 2025 |  |  | 994,263 |  |  | $ | 7.17 |  |  |  | 4.09 |  |  | $ | 23 |
Exercisable at March 31, 2025 |  |  | 628,327 |  |  | $ | 7.16 |  |  |  | 2.93 |  |  | $ | 16 |

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