Stock Options (Detail) - USD ($)	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercised	(452)
2012 Employee Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, beginning of year	70,600	112,500
Granted	25,000	5,000
Terminated	(4,000)	(11,400)
Exercised	(34,400)	(35,500)
Outstanding, end of year	57,200	70,600
Exercisable, end of year	30,400	38,700
Weighted average fair value at grant date of options granted	$ 5.61	$ 5.22
Total intrinsic value of options exercised	$ 187,000	$ 152,000
Total intrinsic value of options outstanding	324,000	252,000
Total intrinsic value of options exercisable	$ 246,000	$ 132,000
Outstanding, beginning of year, weighted average exercise price	$ 5.84	$ 5.54
Granted, weighted average exercise price	9.01	8.15
Terminated/Lapsed, weighted average exercise price	9.15	6.10
Exercised, weighted average exercise price	5.68	5.13
Outstanding, end of period, weighted average exercise price	7.09	5.84
Exercisable, end of period, weighted average exercise price	$ 6.55	$ 5.98
2012 Non-Employee Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, beginning of year	14,200	35,000
Granted	15,000	0
Terminated	0	0
Exercised	(1,400)	(20,800)
Outstanding, end of year	27,800	14,200
Exercisable, end of year	13,800	5,200
Weighted average fair value at grant date of options granted	$ 5.55
Total intrinsic value of options exercised	$ 14,000	$ 96,000
Total intrinsic value of options outstanding	217,000	67,000
Total intrinsic value of options exercisable	$ 125,000	$ 24,000
Outstanding, beginning of year, weighted average exercise price	$ 4.69	$ 4.73
Granted, weighted average exercise price	8.70	0
Terminated/Lapsed, weighted average exercise price	0	0
Exercised, weighted average exercise price	4.73	4.76
Outstanding, end of period, weighted average exercise price	6.85	4.69
Exercisable, end of period, weighted average exercise price	$ 5.61	$ 4.76
2002 Employee Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, beginning of year	5,000	102,500
Granted	0	0
Terminated	0	(10,500)
Exercised	(5,000)	(87,000)
Outstanding, end of year	0	5,000
Exercisable, end of year	0	5,000
Weighted average fair value at grant date of options granted	$ 0	$ 0
Total intrinsic value of options exercised	$ 47,000	$ 289,000
Total intrinsic value of options outstanding	0	20,000
Total intrinsic value of options exercisable	$ 0	$ 20,000
Outstanding, beginning of year, weighted average exercise price	$ 5.35	$ 6.04
Granted, weighted average exercise price	0	0
Terminated/Lapsed, weighted average exercise price	0	6.02
Exercised, weighted average exercise price	5.35	6.08
Outstanding, end of period, weighted average exercise price	0	5.35
Exercisable, end of period, weighted average exercise price	$ 0	$ 5.35