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Background and Liquidity (Details Narrative) - USD ($)			12 Months Ended
	May 05, 2020	May 03, 2020	Apr. 30, 2021	Apr. 30, 2020
Net loss			$ (14,760,000)	$ (10,352,000)
Net cash used in operating activities			(11,674,000)	(10,579,000)
Cash			83,400,000
Accumulated deficit			(234,896,000)	(220,136,000)
Cash, cash equivalents and restricted cash on hand			83,634,000	10,930,000
Revenues			$ 1,206,000	$ 1,682,000
Paycheck Protection Program [Member]
Proceeds from loan	$ 900,000	$ 890,347

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