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Note 12 - Accounting for the Costs of Computer Software Developed for Internal Use (Details Textual) - USD ($) | 12 Months Ended
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Apr. 30, 2023 | Apr. 30, 2022 | Apr. 30, 2021
Capitalized Computer Software, Additions | $ 110,000 | $ 145,000 |
Capitalized Computer Software, Amortization | $ 49,000 | $ 73,000 | $ 70,000
Minimum [Member] |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) | 3 years |  |
Maximum [Member] |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) | 5 years |  |

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- Definition Additions made to capitalized computer software costs during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482665/350-30-50-1 + Details
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Period Type: | duration

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- Definition Amount of expense for amortization of capitalized computer software costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 985 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481283/985-20-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(1) -SubTopic 20 -Topic 985 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481283/985-20-50-1 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

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