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Note 6 - Stock-based Compensation - Non-cash Stock Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Stock-based compensation expense $ 235 $ 159 $ 462 $ 320
Share-Based Payment Arrangement, Option [Member]        
Stock-based compensation expense 190 152 378 308
Restricted Stock [Member]        
Stock-based compensation expense $ 45 $ 7 $ 84 $ 12