6. EQUITY COMPENSATION PLANS (Details Narrative) - USD ($)	12 Months Ended
	Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2014
Cash received from stock options exercised	$ 138,000	$ 298,000	$ 944,000
Non Employee [Member]
Unrecognized compensation costs related to non-vested stock options	$ 9,000
Unrecognized compensation cost weighted average vesting period	10 months 21 days
Share-based compensation expense	$ 109,000	$ 289,000	$ 391,000
Stock Incentive Plans [Member]
Common shares reserved for issuance	39,561,165
Share-based awards [Member]
Common shares reserved for issuance	15,809,904
Stock Option [Member]
Common shares reserved for issuance	23,751,261
Weighted-average grant date fair value of options granted	$ 1.01	$ 1.43	$ 1.19
Aggregate intrinsic value of stock options exercised	$ 93,000	$ 192,000	$ 908,000
Cash received from stock options exercised	138,000	298,000	944,000
Issuance costs	1,000	3,000	4,000
Unrecognized compensation costs related to non-vested stock options	$ 2,829,000
Unrecognized compensation cost weighted average vesting period	1 year 6 months 22 days
Restricted Stock Awards [Member]
Unrecognized compensation costs related to non-vested stock options	$ 0	$ 0	$ 0
Weighted average grant date fair value, other than options			$ 1.39
Aggregate fair value, other than options			$ 139,000
Restricted stock awards granted	0	0
Restricted stock awards vested	0	0
Employee Stock Purchase Plan [Member]
Common shares reserved for issuance	5,000,000
Shares available for purchase	1,408,659
ESOP shares purchased	1,034,397	497,453	498,050
ESPO weighted average purchase price	$ 0.52	$ 1.22	$ 1.09
Common stock issued under ESPP plan, shares purchased	1,034,397	497,453	498,050
Weighted average grant date fair value, other than options	$ 0.34	$ 0.56	$ 0.55