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