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Stock Options - Stock options outstanding under the 2012 Employee Plan (Details)
3 Months Ended
Sep. 30, 2019
$ / shares
shares
2012 Employee Stock Option Plan [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options outstanding, Number outstanding | shares 80,500
Options outstanding, Weighted average remaining contractual life 7 years 7 months 6 days
Options outstanding, Weighted average exercise price $ 12.51
Options exercisable, Number exercisable | shares 35,400
Options exercisable, Weighted average exercise price $ 8.62
2012 Employee Stock Option Plan [Member] | Exercise price range $4.37-$26.06 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options outstanding, Number outstanding | shares 80,500
Options outstanding, Weighted average remaining contractual life 7 years 7 months 6 days
Options outstanding, Weighted average exercise price $ 12.51
Options exercisable, Number exercisable | shares 35,400
Options exercisable, Weighted average exercise price $ 8.62
Exercise price upper limit 4.37
Exercise price lower limit $ 26.06
2012 Non-Employee Stock Option Plan [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options outstanding, Number outstanding | shares 10,200
Options outstanding, Weighted average remaining contractual life 7 years 6 months
Options outstanding, Weighted average exercise price $ 7.99
Options exercisable, Number exercisable | shares 3,000
Options exercisable, Weighted average exercise price $ 6.27
2012 Non-Employee Stock Option Plan [Member] | Exercise price range $4.37 - $8.70 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options outstanding, Number outstanding | shares 10,200
Options outstanding, Weighted average remaining contractual life 7 years 6 months
Options outstanding, Weighted average exercise price $ 7.99
Options exercisable, Number exercisable | shares 3,000
Options exercisable, Weighted average exercise price $ 6.27
Exercise price upper limit 8.70
Exercise price lower limit $ 4.37
2018 Non-Employee Stock Option Plan  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options outstanding, Number outstanding | shares 15,200
Options outstanding, Weighted average remaining contractual life 9 years 2 months 12 days
Options outstanding, Weighted average exercise price $ 16.20
Options exercisable, Number exercisable | shares 2,400
Options exercisable, Weighted average exercise price $ 16.20
2018 Non-Employee Stock Option Plan | Excercise price range $16.20 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options outstanding, Number outstanding | shares 15,200
Options outstanding, Weighted average remaining contractual life 9 years 2 months 12 days
Options outstanding, Weighted average exercise price $ 16.20
Options exercisable, Number exercisable | shares 2,400
Options exercisable, Weighted average exercise price $ 16.20
Exercise price upper limit 16.20
Exercise price lower limit $ 16.20