10. SALE OF RESEARCH AND DEVELOPMENT ASSETS (Tables)

9 Months Ended

Jan. 31, 2018

Discontinued Operations and Disposal Groups [Abstract]

Discontinued operations summary

	Three Months Ended January 31,				Nine Months Ended January 31,
	2018		2017		2018		2017
Operating expenses:
Research and development	$	374,000	$	5,912,000	$	7,590,000	$	21,347,000
Selling, general and administrative		1,315,000		293,000		2,097,000		1,256,000
Restructuring charges		–		–		330,000		–
Total operating expenses		1,689,000		6,205,000		10,017,000		22,603,000
Other expense		387,000		–		387,000		–
Loss from discontinued operations	$	2,076,000	$	6,205,000	$	10,404,000	$	22,603,000