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Schedule of Components of Property and Equipment (Details) - USD ($) $ in Thousands	Jul. 31, 2021	Apr. 30, 2021
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,625	$ 1,619
Less: accumulated depreciation	(1,252)	(1,213)
Property and equipment, net	373	406
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	311	291
Computer Equipment & Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	486	498
Office Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	339	341
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	474	474
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 15	$ 15

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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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