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Note 17 - Stock-based Compensation Plans - Total Estimated Stock-based Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jan. 31, 2020 | Jan. 31, 2019 | Jan. 31, 2018
Stock-based compensation expense | $ 4,909 | $ 3,710 | $ 2,807
Cost of Sales [Member] |  |  |
Stock-based compensation expense | 220 | 160 | 90
Selling and Marketing Expense [Member] |  |  |
Stock-based compensation expense | 706 | 436 | 246
Research and Development Expense [Member] |  |  |
Stock-based compensation expense | 281 | 184 | 85
General and Administrative Expense [Member] |  |  |
Stock-based compensation expense | $ 3,702 | $ 2,930 | $ 2,386

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