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Lines of Credit and Paycheck Protection Program Loan - Narrative (Detail)
1 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2020
USD ($)
May 02, 2021
USD ($)
May 03, 2020
USD ($)
Apr. 28, 2019
USD ($)
May 02, 2021
CNY (¥)
Apr. 15, 2020
USD ($)
Line Of Credit Facility [Line Items]              
Outstanding amount       $ 29,750,000      
Repayments of debt     $ 30,772,000   $ 12,000,000    
Paycheck Protection Program (PPP) loan amount       7,606,000      
Interest paid during the year     60,000 $ 124,000 $ 54,000    
Paycheck Protection Program, CARES Act [Member]              
Line Of Credit Facility [Line Items]              
Paycheck Protection Program (PPP) loan amount             $ 7,600,000
Revolving Credit Facility [Member] | United States [Member]              
Line Of Credit Facility [Line Items]              
Maximum borrowing capacity     $ 30,000,000        
Expiration date     Aug. 15, 2022        
Maximum amount of letters of credit     $ 1,000,000        
Applicable interest rate at end of period     1.71% 1.75%   1.71%  
Interest rate description     Interest was charged under the Credit Agreement at a rate as a variable spread over LIBOR based on our ratio of debt to EBITDA.        
Reference rate on which the interest rate is based     LIBOR        
Percentage of common stock in subsidiary pledge as collateral     65.00%        
Outstanding amount     $ 0 $ 29,800,000      
Additional borrowings amount     0        
Repayments of debt   $ 29,800,000          
Letters of credit, outstanding amount     275,000 $ 250,000      
Revolving Credit Facility [Member] | United States [Member] | Seventh Amendment to Credit Agreement [Member]              
Line Of Credit Facility [Line Items]              
Annual capital expenditures     10,000,000        
Reduced percentage of allowable liens and other indebtedness   5.00%          
Revolving Credit Facility [Member] | United States [Member] | Seventh Amendment to Credit Agreement [Member] | Maximum [Member]              
Line Of Credit Facility [Line Items]              
Maximum allowable payment of dividends or stock repurchase   $ 10,000,000          
Revolving Credit Facility [Member] | United States [Member] | Seventh Amendment to Credit Agreement [Member] | Price Level I [Member]              
Line Of Credit Facility [Line Items]              
Percentage of pricing matrix increased 1.60%            
Revolving Credit Facility [Member] | United States [Member] | Seventh Amendment to Credit Agreement [Member] | Price Level II [Member]              
Line Of Credit Facility [Line Items]              
Percentage of pricing matrix increased 2.05%            
Revolving Credit Facility [Member] | United States [Member] | Seventh Amendment to Credit Agreement [Member] | Price Level III [Member]              
Line Of Credit Facility [Line Items]              
Percentage of pricing matrix increased 2.50%            
Revolving Credit Facility [Member] | United States [Member] | Seventh Amendment to Credit Agreement [Member] | Price Level IV [Member]              
Line Of Credit Facility [Line Items]              
Percentage of pricing matrix increased 3.00%            
Revolving Credit Facility [Member] | United States [Member] | Letters of Credit [Member]              
Line Of Credit Facility [Line Items]              
Remaining letters of credit     725,000        
Revolving credit agreements [Member] | China [Member] | Chinese Yuan Renminbi [Member]              
Line Of Credit Facility [Line Items]              
Maximum borrowing capacity     $ 6,200,000     ¥ 40,000,000  
Expiration date     Dec. 01, 2021        
Applicable interest rate at end of period       2.41%      
Interest rate description     This agreement has an interest rate determined by the Chinese government at the time of borrowing        
Outstanding amount     $ 0 $ 1,000,000.0      
Additional borrowings amount     0        
Repayments of debt   $ 1,000,000.0          
Revolving credit agreements [Member] | China [Member] | United States Dollar [Member]              
Line Of Credit Facility [Line Items]              
Maximum borrowing capacity     $ 2,000,000        
Expiration date     Jul. 07, 2021        
Interest rate description     This agreement has an interest rate determined by the Chinese government at the time of borrowing        
Outstanding amount     $ 0