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Income Taxes (Details Narrative) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020	Apr. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Income tax examination description			The Company sold New Jersey State net operating losses and research development credits (“NJ NOL”) under the NJEDA Tax Transfer program in the amount of approximately $12 million for the year ended April 30, 2021, for net proceeds of approximately $1.0 million which was received in May 2021 and recorded in the Company’s Statement of Operations in fiscal year 2022.
Net operating loses and research and development credits	$ (5,185)	$ (3,002)	$ (10,215)	$ (6,406)
NJNOL [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net operating loses and research and development credits					$ 12,000
Net proceeds					$ 1,000

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