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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