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Stock Options - Stock options outstanding under the 2012 Employee Plan (Details)
12 Months Ended
Jun. 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 72,500
Options outstanding, Weighted average remaining contractual life 7 years 7 months 6 days
Options outstanding, Weighted average exercise price | $ / shares $ 11.01
Options exercisable, Number exercisable | shares 33,800
Options exercisable, Weighted average exercise price | $ / shares $ 8.05
2012 Employee Stock Option Plan [Member] | Exercise price range $ 4.29 - $ 9.63 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options outstanding, Number outstanding | shares 72,500
Options outstanding, Weighted average remaining contractual life 7 years 7 months 6 days
Options outstanding, Weighted average exercise price | $ / shares $ 11.01
Options exercisable, Number exercisable | shares 33,800
Options exercisable, Weighted average exercise price | $ / shares $ 8.05
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 9 months 18 days
Options outstanding, Weighted average exercise price | $ / shares $ 7.99
Options exercisable, Number exercisable | shares 3,000
Options exercisable, Weighted average exercise price | $ / shares $ 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 9 months 18 days
Options outstanding, Weighted average exercise price | $ / shares $ 7.99
Options exercisable, Number exercisable | shares 3,000
Options exercisable, Weighted average exercise price | $ / shares $ 6.27