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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Jan. 31, 2021 | Jan. 31, 2020 | Jan. 31, 2019 | Jan. 31, 2018
Effective tax rate for income from continuing operation | 41.10% | 28.40% | 21.60% |
Valuation allowance | $ 1,721,000 | $ 1,752,000 |  |
Recognized (benefit) expense related to interest and penalties | 50,000 | 114,000 | $ 8,000 |
Accrued potential interest and penalties |  | 300,000 |  |
Deferred Tax Assets Operating loss carryforwards | 154,000 | 443,000 |  |
Deferred tax assets tax credit carryforwards research | $ 1,546,000 | 1,496,000 |  |
Deferred tax assets tax credit carryforwards expiration period | 2021 through 2028 |  |  |
Deemed repatriated earnings | $ 5,700,000 |  |  |
Recognized tax benefits excluding interest and penalties | 384,000 | 362,000 | $ 618,000 | $ 665,000
CHINA |  |  |  |
Deferred Tax Assets Operating loss carryforwards | $ 400,000 |  |  |
Deferred tax assets operating loss carryforwards expiration period | 2022 through 2026 |  |  |
DELAWARE |  |  |  |
Deferred Tax Assets Operating loss carryforwards | $ 200,000 |  |  |
Federal Tax [Member] |  |  |  |
Recognized (benefit) expense related to interest and penalties |  | 74,000 |  |
Recognized tax benefits excluding interest and penalties |  | $ 232,000 |  |

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