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Stock Options by Range of Exercise Prices (Detail)
12 Months Ended
Jun. 30, 2017
$ / shares
shares
Employee 2012 Stock Option Plan [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding, Number outstanding | shares 70,600
Options Outstanding, Weighted average remaining contractual life 7 years
Options Outstanding, weighted average exercise price | $ / shares $ 5.84
Options exercisable, Number exercisable | shares 38,700
Options exercisable, Weighted average exercise price | $ / shares $ 5.58
Employee 2012 Stock Option Plan [Member] | Exercise price range $ 4.29 - $ 8.15 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding, Number outstanding | shares 70,600
Options Outstanding, Weighted average remaining contractual life 7 years
Options Outstanding, weighted average exercise price | $ / shares $ 5.84
Options exercisable, Number exercisable | shares 38,700
Options exercisable, Weighted average exercise price | $ / shares $ 5.58
NonEmployee 2012 Stock Option Plan [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding, Number outstanding | shares 14,200
Options Outstanding, Weighted average remaining contractual life 6 years 7 months 6 days
Options Outstanding, weighted average exercise price | $ / shares $ 4.69
Options exercisable, Number exercisable | shares 5,200
Options exercisable, Weighted average exercise price | $ / shares $ 4.76
NonEmployee 2012 Stock Option Plan [Member] | Exercise price range $4.37 - $4.88 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding, Number outstanding | shares 14,200
Options Outstanding, Weighted average remaining contractual life 6 years 7 months 6 days
Options Outstanding, weighted average exercise price | $ / shares $ 4.69
Options exercisable, Number exercisable | shares 5,200
Options exercisable, Weighted average exercise price | $ / shares $ 4.76
2002 Employee Stock Option Plan [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding, Number outstanding | shares 5,000
Options Outstanding, Weighted average remaining contractual life 3 months 18 days
Options Outstanding, weighted average exercise price | $ / shares $ 5.35
2002 Employee Stock Option Plan [Member] | Exercise price range $ 5.35 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding, Number outstanding | shares 5,000
Options Outstanding, Weighted average remaining contractual life 3 months 18 days
Options Outstanding, weighted average exercise price | $ / shares $ 5.35