Note 5 - Stock-based Compensation (Details Textual) - USD ($) |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Share-Based Payment Arrangement, Expense | $ 436,000 | $ 417,000 | $ 816,000 | $ 902,000 |
| The 2024 Stock Plan [Member] | ||||
| Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) | 14,105 | 14,105 | ||
| Equity Classified Warrants [Member] | ||||
| Share-Based Payment Arrangement, Expense | $ 47,000 | 29,000 | $ 86,000 | 56,000 |
| Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ 305,000 | $ 319,000 | $ 305,000 | $ 319,000 |