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Note 8 - Stock-based Compensation - Stock-based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 31, 2025
Oct. 31, 2024
Oct. 31, 2025
Oct. 31, 2024
Restricted Stock [Member]        
Stock-based compensation expense $ 320 $ 232 $ 2,012 $ 629