Common Stock and Stock Options (Details 1) (USD $)	12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010
Summary of changes in common stock options
Common stock options shares, Beginning balance	2,303,706	2,369,516	2,450,791
Common stock options shares, Granted	215,000	259,000	248,500
Common stock options shares, Exercised	(365,705)	(227,935)	(146,900)
Common stock options shares, Surrendered	(134,525)	(96,875)	(182,875)
Common stock options shares, Ending balance	2,018,476	2,303,706	2,369,516
Weighted Average Exercise Price, Beginning balance	$ 4.83	$ 4.58	$ 4.54
Weighted Average Exercise Price, Granted	$ 6.26	$ 5.54	$ 5.11
Weighted Average Exercise Price, Exercised	$ 3.95	$ 3.03	$ 2.52
Weighted Average Exercise Price, Surrendered	$ 5.17	$ 4.90	$ 6.43
Weighted Average Exercise Price, Ending balance	$ 5.11	$ 4.83	$ 4.58