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Note 10 - Stock-based Compensation (Details Textual) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2019 shares | Jul. 31, 2018 USD ($) | Jan. 31, 2020 USD ($) shares | Jan. 31, 2019 USD ($) shares | Jan. 31, 2018 shares
Number of Incentive Stock Plans Under Which New Awards May Be Granted |  |  | 1 |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) | shares |  |  | 613,904 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total (in shares) | shares |  |  | 0 | 0 |
Proceeds from Stock Options Exercised | $ |  |  | $ 0.4 | $ 0.5 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value | $ |  |  | $ 0.1 | $ 0.1 |
Percentage of Options Expected to Vest |  |  | 94.00% |  |
Director [Member] |  |  |  |  |
Deferred Stock Compensation Arrangements, Classified from a Liability to Additional Paid In Capital | $ |  | $ 0.7 |  |  |
Share-based Payment Arrangement, Option [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  | 4 years |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) |  |  | 10 years |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ |  |  | $ 0.1 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  | 146 days |  |
Deferred Stock [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | shares | 23,104 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance (in shares) | shares |  |  | 125,049 |  |
Restricted Stock [Member] |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ |  |  | $ 1.5 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  | 2 years 36 days |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | shares |  |  | 152,000 | 148,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance (in shares) | shares |  |  | 358,000 | 283,000 | 360,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value | $ |  |  | $ 0.8 | $ 1.1 |
Restricted Stock [Member] | Minimum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  | 3 years |  |
Restricted Stock [Member] | Maximum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  | 4 years |  |

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