2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2)	12 Months Ended
	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2011
Shares excluded from EPS computation	3,813,278	207,060	174,679
Stock options and awards
Shares excluded from EPS computation	3,505,777	96,591	85,361
Employee stock purchase plan
Shares excluded from EPS computation	307,501	110,469	20,327
Warrants
Shares excluded from EPS computation	0	0	68,991