5. INVENTORIES (Details Narrative) - USD ($)	3 Months Ended
Jul. 31, 2017	Jul. 31, 2016
Cost of contract manufacturing	$ 20,448,000	$ 3,062,000
Idle Capacity Costs [Member]
Cost of contract manufacturing	$ 900,000	$ 0

Costs incurred in production of other products during the reporting period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2(a))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration