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Note 17 - Concentration of Credit Risks (Details Textual) - USD ($) | Apr. 30, 2024 | Apr. 30, 2023 | Mar. 12, 2023 | Apr. 30, 2022 | Jan. 31, 2022
--- | --- | --- | --- | --- | ---
Cash, Uninsured Amount | $ 1,419,000 | $ 1,569,000 |  |  |
Restricted Cash, Total | $ 305,000 | $ 305,000 |  | $ 305,000 |
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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- Definition Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-8 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(1)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 + Details
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