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Capital Stock Transactions (Stock Option Plans) (Narrative) (Details)
12 Months Ended
Jun. 30, 2021
$ / shares
shares
Jun. 30, 2020
$ / shares
shares
Jun. 30, 2019
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price | $ / shares $ 1.47 $ 1.47 $ 1.48
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 157,000 157,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 157,000 157,000 213,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price | $ / shares $ 1.47 $ 1.47  
Share Based Compensation Arrangement by Share Based Payment Award, Unvested 0    
Share-based Payment Arrangement, Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Plans 2    
Exercise period 10 years    
Exercise Price, Range Three [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price | $ / shares $ 1.57    
Share-based Payment Arrangement, Option, Exercise Price Range, Shares Exercisable 136,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 136,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price | $ / shares $ 1.57    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 2 years 9 months 29 days    
Exercise Price, Range One [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price | $ / shares $ 0.79    
Share-based Payment Arrangement, Option, Exercise Price Range, Shares Exercisable 21,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 21,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price | $ / shares $ 0.79    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 4 years 9 months 29 days    
Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 1 year    
Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 5 years