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Stock Options (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
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 20,000 5,000 20,000 5,000
Terminated/Lapsed     0 (400)
Exercised     (2,500) (1,500)
Outstanding, end of period 88,100 115,600 88,100 115,600
Exercisable, end of period 60,300 74,500 60,300 74,500
Weighted average fair value at grant date of options granted     $ 111,000 $ 26,000
Total intrinsic value of options exercised     $ 7,000 $ 9,000
Total intrinsic value of options outstanding $ 279,000 $ 331,000 279,000 331,000
Total intrinsic value of options exercisable $ 221,000 $ 218,000 $ 221,000 $ 218,000
Outstanding, beginning of year, weighted average exercise price     $ 5.84 $ 5.54
Granted, weighted average exercise price     8.97 8.15
Terminated/Lapsed, weighted average exercise price     0 6.31
Exercised, weighted average exercise price     6.31 6.31
Outstanding, end of period, weighted average exercise price $ 6.53 $ 5.64 6.53 5.64
Exercisable, end of period, weighted average exercise price $ 6.03 $ 5.57 $ 6.03 $ 5.57
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/Lapsed     0 0
Exercised     0 (5,200)
Outstanding, end of period 29,200 29,800 29,200 29,800
Exercisable, end of period 15,200 20,800 15,200 20,800
Weighted average fair value at grant date of options granted     $ 83,000 $ 0
Total intrinsic value of options exercised     $ 0 $ 25,000
Total intrinsic value of options outstanding $ 86,000 $ 112,000 86,000 112,000
Total intrinsic value of options exercisable $ 63,000 $ 78,000 $ 63,000 $ 78,000
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     0 4.76
Outstanding, end of period, weighted average exercise price $ 6.75 $ 4.73 6.75 4.73
Exercisable, end of period, weighted average exercise price $ 5.53 $ 4.76 $ 5.53 $ 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/Lapsed     0 (10,500)
Exercised     (5,000) (52,000)
Outstanding, end of period 0 40,000 0 40,000
Exercisable, end of period 0 40,000 0 40,000
Weighted average fair value at grant date of options granted     $ 0 $ 0
Total intrinsic value of options exercised     $ 20,000 $ 114,000
Total intrinsic value of options outstanding $ 0 $ 113,000 0 113,000
Total intrinsic value of options exercisable $ 0 $ 113,000 $ 0 $ 113,000
Outstanding, beginning of year, weighted average exercise price     $ 5.35 $ 6.04
Terminated/Lapsed, weighted average exercise price     0 6.02
Exercised, weighted average exercise price     5.35 6.31
Outstanding, end of period, weighted average exercise price $ 0 $ 5.69 0 5.69
Exercisable, end of period, weighted average exercise price $ 0 $ 5.69 $ 0 $ 5.69