3. Assets Held for Sale (Details) - Disclosure of Long Lived Assets Held-for-sale - USD ($) $ in Thousands	Apr. 30, 2019	Apr. 30, 2018
Disclosure of Long Lived Assets Held-for-sale [Abstract]
Cash and cash equivalents	$ 35	$ 0
Accounts receivable, net	348
Inventories, net	876
Other current assets	88
Property, plant and equipment, net	202
Total assets held for sale	1,549
Accounts payable – trade	707
Accrued liabilities	315
Other current liabilities	56
Other liabilities	2,253
Total liabilities held for sale	$ 3,331