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Note 9 - Stock-based Compensation - Summary of Stock-based Compensation (Details) - USD ($) $ in Thousands | 3 Months Ended
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Apr. 30, 2025 | Apr. 30, 2024
Stock-based compensation expense | $ 4,081 | $ 7,153
Cost of Sales [Member] |  |
Stock-based compensation expense | 117 | 166
Research and Development Expense [Member] |  |
Stock-based compensation expense | 1,022 | 1,290
Selling and Marketing Expense [Member] |  |
Stock-based compensation expense | 805 | 1,256
General and Administrative Expense [Member] |  |
Stock-based compensation expense | $ 2,137 | $ 4,441

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