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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