8. EQUITY COMPENSATION PLANS (Tables)

3 Months Ended

Jul. 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, 2018		3,597,738		$	8.74
Granted		162,948			3.80
Exercised		(301,052	)		3.37
Canceled or expired		(499,600	)		11.00
Outstanding, July 31, 2018		2,960,034		$	8.64

Schedule of restricted stock right transaction activity

Restricted Stock Rights	Shares		Weighted Average Grant Date Fair Value
Outstanding, May 1, 2018		–	$	–
Granted		128,050		3.62
Vested		–		–
Forfeited		–		–
Outstanding, July 31, 2018		128,050	$	3.62

Schedule of stock-based compensation expense

	Three Months Ended July 31,
	2018		2017
Cost of contract manufacturing	$	85	$	–
Selling, general and administrative		212		205
Discontinued operations		–		280
Total	$	297	$	485
Stock-based compensation from:
Stock options	$	254	$	409
Restricted stock rights		15		–
ESPP		28		76
	$	297	$	485