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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Jan. 31, 2022 | Jan. 31, 2021 | Jan. 31, 2020 | Jan. 31, 2019
Effective tax rate for income from continuing operation | 8.60% | 41.10% | 28.40% |
Valuation allowance | $ 1,778,000 | $ 1,721,000 |  |
Recognized (benefit) expense related to interest and penalties | 211,000 | 50,000 |  |
Accrued potential interest and penalties | 95,000 |  |  |
Deferred Tax Assets Operating loss carryforwards | 152,000 | 154,000 |  |
Deferred tax assets tax credit carryforwards research | $ 1,925,000 | 1,546,000 |  |
Deferred tax assets tax credit carryforwards expiration period | 2022 through 2029 |  |  |
Deemed repatriated earnings | $ 7,300,000 |  |  |
Recognized tax benefits excluding interest and penalties | 303,000 | 384,000 | $ 362,000 | $ 618,000
Foreign tax credit | 154,000 | $ 83,000 |  |
Additional Foreign Tax Credit [Member] |  |  |  |
Foreign tax credit | 200,000 |  |  |
Tax Credits Carry Forwards [Member] |  |  |  |
Deferred tax assets tax credit carryforwards research | 1,600,000 |  |  |
CHINA |  |  |  |
Deferred Tax Assets Operating loss carryforwards | $ 600,000 |  |  |
Deferred tax assets operating loss carryforwards expiration period | 2023 through 2027 |  |  |
DELAWARE |  |  |  |
Deferred Tax Assets Operating loss carryforwards | $ 100,000 |  |  |
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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