Stock Options (Detail) (USD $)	3 Months Ended	6 Months Ended
	Dec. 31, 2012 Employee Stock Option Plan 2002 [Member]	Dec. 31, 2012 Employee Stock Option Plan 2002 [Member]	Dec. 31, 2011 Employee Stock Option Plan 2002 [Member]	Jun. 30, 2011 Employee Stock Option Plan 2002 [Member]	Dec. 31, 2012 Stock Option Plan 2000 [Member]	Jun. 30, 2012 Stock Option Plan 2000 [Member]	Dec. 31, 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		1,380,140		1,380,140		30,000		30,000
Exercised	702,000	729,000
Outstanding, end of period	651,140	651,140	1,380,140		30,000		30,000
Exercisable, end of period	651,140	651,140	1,380,140		30,000		30,000
Total intrinsic value of options exercised		$ 1,301,000
Total intrinsic value of options outstanding	476,000	476,000	600,000
Total intrinsic value of options exercisable	$ 476,000	$ 476,000	$ 600,000
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		$ 1.85
Outstanding, end of period, weighted average exercise price	$ 4.18	$ 4.18	$ 2.95	$ 2.95	$ 5.03	$ 5.03	$ 5.03	$ 5.03
Exercisable, end of period, weighted average exercise price	$ 4.18	$ 4.18	$ 2.95		$ 5.03		$ 5.03