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Note 6 - Stock-based Compensation - Non-cash Stock Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Stock-based compensation expense | $ 236 | $ 170 | $ 698 | $ 490
Share-Based Payment Arrangement, Option [Member] |  |  |  |
Stock-based compensation expense | 192 | 164 | 570 | 472
Restricted Stock [Member] |  |  |  |
Stock-based compensation expense | $ 44 | $ 6 | $ 128 | $ 18

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