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Stock Options - Outstanding (Details)
12 Months Ended
Jun. 30, 2021
$ / shares
shares
2012 Employee Stock Option Plan  
Share based compensation, exercise prices  
Options outstanding (in shares) | shares 214,080
Weighted average remaining contractual life 7 years 4 months 24 days
Weighted average exercise price $ 9.59
Number exercisable | shares 98,176
Exercisable, Weighted average exercise price $ 8.07
2012 Employee Stock Option Plan | Exercise price range  
Share based compensation, exercise prices  
Exercise price upper limit 2.19
Exercise price lower limit $ 16.80
Options outstanding (in shares) | shares 214,080
Weighted average remaining contractual life 7 years 4 months 24 days
Weighted average exercise price $ 9.59
Number exercisable | shares 98,176
Exercisable, Weighted average exercise price $ 8.07
2012 Non-Employee Stock Option Plan  
Share based compensation, exercise prices  
Options outstanding (in shares) | shares 12,000
Weighted average remaining contractual life 7 years 1 month 6 days
Weighted average exercise price $ 6.55
Number exercisable | shares 6,240
Exercisable, Weighted average exercise price $ 6.04
2012 Non-Employee Stock Option Plan | Exercise price range  
Share based compensation, exercise prices  
Exercise price upper limit 2.19
Exercise price lower limit $ 11.68
Options outstanding (in shares) | shares 12,000
Weighted average remaining contractual life 7 years 1 month 6 days
Weighted average exercise price $ 6.55
Number exercisable | shares 6,240
Exercisable, Weighted average exercise price $ 6.04
2018 Non-Employee Stock Option Plan  
Share based compensation, exercise prices  
Options outstanding (in shares) | shares 70,100
Weighted average remaining contractual life 8 years 2 months 12 days
Weighted average exercise price $ 11.93
Number exercisable | shares 29,960
Exercisable, Weighted average exercise price $ 11.68
2018 Non-Employee Stock Option Plan | Exercise price range  
Share based compensation, exercise prices  
Exercise price upper limit 8.10
Exercise price lower limit $ 15.27
Options outstanding (in shares) | shares 70,100
Weighted average remaining contractual life 8 years 2 months 12 days
Weighted average exercise price $ 11.93
Number exercisable | shares 29,960
Exercisable, Weighted average exercise price $ 11.68
2020 Non-Employee Stock Option Plan  
Share based compensation, exercise prices  
Options outstanding (in shares) | shares 10,000
Weighted average remaining contractual life 9 years 2 months 12 days
Weighted average exercise price $ 11.40
Number exercisable | shares 2,000
Exercisable, Weighted average exercise price $ 11.40
2020 Non-Employee Stock Option Plan | Exercise price range  
Share based compensation, exercise prices  
Exercise price upper limit $ 11.40
Options outstanding (in shares) | shares 10,000
Weighted average remaining contractual life 9 years 2 months 12 days
Weighted average exercise price $ 11.40
Number exercisable | shares 2,000
Exercisable, Weighted average exercise price $ 11.40