Common Stock Warrants (Details) (USD $)	12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010
Common stock warrant activity
Warrants outstanding, Beginning balance	2,690,424	3,241,992	3,121,421
Warrants issued	82,856		147,330
Warrants issued, price range	$ 9.65		$ 5.43
Warrants exercised	(313,239)	(548,366)	(879)
Warrants exercised, Price range			$ 1.55
Warrants expired	(2,608)	(3,202)	(25,880)
Warrants expired, Price range	$ 8.83	$ 9.28
Warrants outstanding, Ending balance	2,457,433	2,690,424	3,241,992
Minimum [Member]
Common stock warrant activity
Warrants outstanding, Price range, Beginning balance	8.78	5.43	1.55
Warrants issued, price range	$ 9.33
Warrants exercised, Price range	$ 8.78	$ 5.43
Warrants expired, Price range	$ 8.79		$ 1.55
Warrants outstanding, Price range, Ending balance	8.83	8.78	5.43
Maximum [Member]
Common stock warrant activity
Warrants outstanding, Price range, Beginning balance	61.30	61.30	61.30
Warrants exercised, Price range	$ 8.83	$ 8.83
Warrants expired, Price range			$ 14.16
Warrants outstanding, Price range, Ending balance	61.30	61.30	61.30