5. INVENTORIES (Tables)

9 Months Ended

Jan. 31, 2018

Inventory Disclosure [Abstract]

Schedule of inventories

	January 31, 2018		April 30, 2017
Raw materials	$	8,799,000	$	11,304,000
Work-in-process		5,419,000		13,755,000
Finished goods		–		8,040,000
Total inventories	$	14,218,000	$	33,099,000