Summary of Significant Accounting Policies (Details - Property and Equipment) - USD ($) $ in Thousands	Jul. 31, 2021	Apr. 30, 2021
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 66,672	$ 58,549
Less: Accumulated depreciation and amortization	(22,103)	(21,094)
Total property and equipment, net	44,569	37,455
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	23,000	23,000
Manufactured Product, Other [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	21,303	20,793
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	5,541	5,541
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	843	843
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 15,985	$ 8,372

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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