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Note 6 - Stock-based Compensation - Non-cash Stock Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
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