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Note 5 - Stock-based Compensation - Schedule of Compensation Expense and Income Tax Benefits (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2026 | Mar. 31, 2025
Stock-based compensation expense | $ 313 | $ 322
Related tax benefits recognized in earnings | 67 | 70
Share-Based Payment Arrangement, Option [Member] |  |
Stock-based compensation expense | 156 | 163
Restricted Stock [Member] |  |
Stock-based compensation expense | $ 157 | $ 159

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