XML 55 R31.htm IDEA: XBRL DOCUMENT v3.21.2
Significant Accounting Policies and Disclosures - Additional Information (Details)
 12 Months Ended
May 29, 2021
USD ($)
Number
$ / shares
shares
May 30, 2020
USD ($)
$ / shares
shares
Jun. 01, 2019
USD ($)
$ / shares
shares
Allowance for doubtful accounts $ 202,000 $ 334,000  
Foreign exchange (gain) loss 759,000 (15,000) $ 84,000
Finished goods 57,000,000.0 51,800,000  
Raw material 3,900,000 3,600,000  
Work in progress 2,600,000 2,100,000  
Inventory valuation reserves 5,900,000 5,400,000  
Inventory provisions 1,041,000 1,013,000 1,076,000
Investments - current 0 16,000,000  
Depreciation 3,200,000 3,100,000 2,900,000
Construction in progress 1,429,000 750,000  
Other non-current liabilities 1,366,000 777,000  
Share-based compensation expense $ 675,000 $ 683,000 $ 697,000
Stock option vesting period 5 years    
Option terms to exercise 10 years    
Exercised | shares 48,825    
Proceeds from share exercised $ 300,000    
Intrinsic value $ 100,000    
Weighted average fair value of stock option grants | $ / shares $ 0.49 $ 0.81 $ 1.71
Total unrecognized compensation costs $ 800,000    
Total grant date fair value stock options vested $ 200,000    
Limit of cash dividends Class B common stock (percent) 90.00%    
Common stock options anti-dilutive | shares 0 1,120,000 882,000
Common Stock      
Common stock shares, authorized | shares 17,000,000    
Common Class B      
Common stock shares, authorized | shares 3,000,000    
Number of votes per share | Number 10    
Employees' 2011 Long-Term Incentive Compensation Plan      
Number of shares authorized | shares 3,500,000    
Number of shares for future issuance | shares 1,558,000    
Option exercisable period 5 years    
Healthcare      
Construction in progress $ 800,000    
Maximum      
Services revenue recognized as percentage of aggregate revenue 5.00%    
Foreign exchange (gain) loss     $ 100,000
Intrinsic value   $ 100,000 $ 100,000
Period of recognition 4 years    
Maximum | Employees' 2011 Long-Term Incentive Compensation Plan      
Option terms to exercise 10 years    
Minimum      
Period of recognition 2 years