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Note 5 - Income Taxes (Details Textual) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 31, 2020 | Oct. 31, 2019 | Oct. 31, 2020 | Oct. 31, 2019
Effective Income Tax Rate Reconciliation, Percent, Total | 0.80% | 127.80% | 6.20% | 48.60%
Other Noncurrent Liabilities [Member] |  |  |  |
Unrecognized Tax Benefits, Ending Balance | $ 0.1 |  | $ 0.1 |

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