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Note 18 - Income Taxes (Details Textual) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jan. 31, 2021 | Jan. 31, 2020 | Jan. 31, 2019
Income Before Taxes, Percent | 26.00% | 23.00% | 21.00%
Effective Income Tax Rate Reconciliation, Percent, Total | 5.00% | 11.00% | 15.00%
Undistributed Earnings of Foreign Subsidiaries | $ 432.7 |  |
Liability for Uncertainty in Income Taxes, Noncurrent | 8.4 |  |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 8.2 |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit | 1.5 |  |
Volunatry Change Elected to Adopt in Accounting for Deferred Revenue for Income Tax Purposes in the United States [Member] |  |  |
Current Federal Tax Expense (Benefit) | (9.3) |  |
Deferred Federal Income Tax Expense (Benefit) | $ 9.3 |  |

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