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Note 7 - Stock-based Compensation - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 31, 2021 | Jul. 31, 2020 | Jul. 31, 2021 | Jul. 31, 2020
Stock-based compensation expense | $ 276 | $ 260 | $ 548 | $ 479
Share-based Payment Arrangement, Option [Member] |  |  |  |
Stock-based compensation expense | 0 | 1 | 0 | 3
Restricted Stock [Member] |  |  |  |
Stock-based compensation expense | $ 276 | $ 259 | $ 548 | $ 476

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