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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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