Stock Options (Detail) (USD $)	3 Months Ended
	Sep. 30, 2012 Employee Stock Option Plan 2002 [Member]	Sep. 30, 2011 Employee Stock Option Plan 2002 [Member]	Jun. 30, 2011 Employee Stock Option Plan 2002 [Member]	Sep. 30, 2012 Stock Option Plan 2000 [Member]	Jun. 30, 2012 Stock Option Plan 2000 [Member]	Sep. 30, 2011 Stock Option Plan 2000 [Member]	Jun. 30, 2011 Stock Option Plan 2000 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, beginning of period, weighted average exercise price	$ 2.95	$ 2.95	$ 2.95	$ 5.03	$ 5.03	$ 5.03	$ 5.03
Exercised, weighted average exercise price	$ 1.76
Outstanding, end of period, weighted average exercise price	$ 2.95	$ 2.95	$ 2.95	$ 5.03	$ 5.03	$ 5.03	$ 5.03
Exercisable, end of period, weighted average exercise price	$ 2.95	$ 2.93		$ 5.03		$ 5.03
Outstanding, beginning of period	1,380,140		1,380,140		30,000		30,000
Exercised	27,000
Outstanding, end of period	1,353,140	1,380,140		30,000		30,000
Exercisable, end of period	1,353,140	1,372,140		30,000		30,000
Total intrinsic value of options exercised	$ 36,000
Total intrinsic value of options outstanding	1,459,000	407,000
Total intrinsic value of options exercisable	$ 1,459,000	$ 407,000