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Note 5 - Income Taxes (Details Textual) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 31, 2021 | Jul. 31, 2020 | Jul. 31, 2021 | Jul. 31, 2020
Effective Income Tax Rate Reconciliation, Percent, Total | 20.10% | (56.80%) | 28.50% | 12.30%
Other Noncurrent Liabilities [Member] |  |  |  |
Unrecognized Tax Benefits, Ending Balance | $ 0.1 |  | $ 0.1 |

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