2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details - Impact on statement of operations and comprehensive loss ) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018
Contract manufacturing revenue	$ 13,781	$ 6,819	$ 36,548	$ 46,678
Cost of contract manufacturing	11,731	10,951	32,972	47,641
Gross profit (loss)	2,050	(4,132)	3,576	(963)
Operating loss	(1,192)	(8,956)	(5,697)	(14,494)
Loss from continuing operations	(1,139)	$ (8,928)	(5,290)	$ (14,429)
Balance Without Adoption of ASC 606 [Member]
Contract manufacturing revenue	14,934		25,870
Cost of contract manufacturing	12,352		25,688
Gross profit (loss)	2,582		182
Operating loss	(660)		(9,091)
Loss from continuing operations	(607)		(8,684)
Effect of Change [Member]
Contract manufacturing revenue	(1,153)		10,678
Cost of contract manufacturing	(621)		7,284
Gross profit (loss)	(532)		3,394
Operating loss	(532)		3,394
Loss from continuing operations	$ (532)		$ 3,394