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Shareholders' Equity - Number of Stock Options Outstanding and Exercisable (Detail) - $ / shares
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Exercise Prices $ 1.35 $ 1.53 $ 1.52
Number Outstanding 480,000 595,000 651,000
Weighted-Average Remaining Contractual Life (in years) 3 years 10 months 24 days    
Number Exercisable 480,000 595,000  
Range One [Member]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Exercise Prices $ 0.71    
Number Outstanding 15,000    
Weighted-Average Remaining Contractual Life (in years) 3 years 2 months 15 days    
Number Exercisable 15,000    
Range Two [Member]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Exercise Prices $ 1.21    
Number Outstanding 60,000    
Weighted-Average Remaining Contractual Life (in years) 6 years 2 months 15 days    
Number Exercisable 60,000    
Range Three [Member]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Exercise Prices $ 1.22    
Number Outstanding 190,000    
Weighted-Average Remaining Contractual Life (in years) 2 years 2 months 4 days    
Number Exercisable 190,000    
Range Four [Member]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Exercise Prices $ 1.38    
Number Outstanding 50,000    
Weighted-Average Remaining Contractual Life (in years) 9 years 2 months 12 days    
Number Exercisable 50,000    
Range Five [Member]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Exercise Prices $ 1.49    
Number Outstanding 90,000    
Weighted-Average Remaining Contractual Life (in years) 4 years 2 months 4 days    
Number Exercisable 90,000    
Range Six [Member]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Exercise Prices $ 1.67    
Number Outstanding 50,000    
Weighted-Average Remaining Contractual Life (in years) 1 year 4 months 9 days    
Number Exercisable 50,000    
Range Seven [Member]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Exercise Prices $ 1.79    
Number Outstanding 25,000    
Weighted-Average Remaining Contractual Life (in years) 5 years 2 months 12 days    
Number Exercisable 25,000