7. EQUITY COMPENSATION PLANS (Tables)

9 Months Ended

Jan. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of stock option transaction activity

Stock Options	Shares		Weighted Average Exercisable Price
Outstanding, May 1, 2017		4,081,548	$	8.77
Granted		679,497	$	4.17
Exercised		(117,019)	$	3.40
Canceled or expired		(654,670)	$	8.42
Outstanding, January 31, 2018		3,989,356	$	8.70

Schedule of share-based compensation expense

	Three Months Ended January 31,				Nine Months Ended January 31,
	2018		2017		2018		2017
Cost of contract manufacturing	$	139,000	$	23,000	$	277,000	$	89,000
Selling, general and administrative		259,000		389,000		589,000		1,183,000
Discontinued operations		14,000		457,000		340,000		1,319,000
Total	$	412,000	$	869,000	$	1,206,000	$	2,591,000
Share-based compensation from:
Stock options	$	374,000	$	815,000	$	1,070,000	$	2,369,000
ESPP		38,000		54,000		136,000		222,000
	$	412,000	$	869,000	$	1,206,000	$	2,591,000