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Note 17 - Concentration of Credit Risks (Details Textual) - USD ($) | Apr. 30, 2023 | Mar. 12, 2023 | Apr. 30, 2022 | Jan. 31, 2022 | Apr. 30, 2021
--- | --- | --- | --- | --- | ---
Cash, Uninsured Amount | $ 1,569,000 |  | $ 1,978,000 |  |
Restricted Cash, Total | $ 305,000 |  | 305,000 |  | $ 469,000
Cash Securing a Letter of Credit Issued as Security Deposit [Member] |  |  |  |  |
Restricted Cash, Total |  |  | $ 469,000 | $ 305,000 |
Cash Securing a Letter of Credit Issued as Security Deposit [Member] | Closing of Signature Bank [Member] |  |  |  |  |
Restricted Cash, Total |  | $ 305,000 |  |  |

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