STOCK OPTION PLANS (Details Textual) (USD $)	12 Months Ended
	Apr. 30, 2013	Apr. 30, 2012
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Outstanding, Number	116,279	33,819
2002 Plan [Member]
Common Stock, Capital Shares Reserved for Future Issuance	59,523
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Outstanding, Number	15,779	5,991
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$ 4.20
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$ 39.90
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	0
2006 Plan [Member]
Common Stock, Capital Shares Reserved for Future Issuance	57,142
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Outstanding, Number	46,571	757
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$ 2.52
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$ 4.20
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	346
2007 Plan [Member]
Common Stock, Capital Shares Reserved for Future Issuance	57,142
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Outstanding, Number	53,929	27,071
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$ 2.73
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$ 21.98
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	1,428