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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Jan. 31, 2023 | Jan. 31, 2022 | Jan. 31, 2021 | Jan. 31, 2020
Effective tax rate for income from continuing operation | 22.00% | 8.60% | 41.10% |
Valuation allowance | $ 2,120,000 | $ 1,778,000 |  |
Recognized (benefit) expense related to interest and penalties | 49,000 | 211,000 |  |
Accrued potential interest and penalties | 77,000 |  |  |
Deferred Tax Assets Operating loss carryforwards | 135,000 | 152,000 |  |
Deferred tax assets tax credit carryforwards research | $ 1,851,000 | 1,925,000 |  |
Deferred tax assets tax credit carryforwards expiration period | 2023 through 2030 |  |  |
Deemed repatriated earnings | $ 8,500,000 |  |  |
Recognized tax benefits excluding interest and penalties | 414,000 | 303,000 | $ 384,000 | $ 362,000
Foreign tax credit | 154,000 | 154,000 |  |
Unrecognized tax benefits as a result of the expiration of the statute of limitations | 49,000 | $ 211,000 | $ 42,000 |
Additional Foreign Tax Credit [Member] |  |  |  |
Foreign tax credit | 200,000 |  |  |
Tax Credits Carry Forwards [Member] |  |  |  |
Deferred tax assets tax credit carryforwards research | 1,900,000 |  |  |
CHINA |  |  |  |
Deferred Tax Assets Operating loss carryforwards | $ 100,000 |  |  |
Deferred tax assets operating loss carryforwards expiration period | 2024 through 2028 |  |  |
DELAWARE |  |  |  |
Deferred Tax Assets Operating loss carryforwards | $ 100,000 |  |  |
Federal Tax [Member] |  |  |  |
Recognized tax benefits excluding interest and penalties | 27,000 |  |  |
Unrecognized tax benefits as a result of the expiration of the statute of limitations | $ 22,000 |  |  |

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