Commitments and Contingencies (Details Narrative) $ in Thousands			9 Months Ended
	Feb. 29, 2016 USD ($)	Sep. 04, 2007 USD ($)	Apr. 30, 2016 USD ($) a	Apr. 30, 2015 USD ($)	Jul. 31, 2015 USD ($)
Area of land | a			4,000
Lease expiration date description			The lease commenced September 15, 2014 and originally expired on September 30, 2015 and we have exercised our one year option to renew that extends the expiration to September 15, 2016. We then have available an additional one year option to extend.
Operating leases, rent expense	$ 0		$ 41	$ 45
Manufacturing costs		$ 471
Cost of utilities		$ 150
Payments to suppliers			1,700
Advances to contract manufacturer			90
Purchase obligation			13,900		$ 13,900
Exer Rest Units [Member]
Purchase obligation, due in next twelve months			2,600
Purchase obligation, due in second year			4,100
Purchase obligation, due in third year			8,800
Sing Lin [Member]
Payables to customers			$ 41