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Note J - Commitments and Contingencies (Details Textual) - USD ($) | 6 Months Ended |
--- | --- | ---
Oct. 31, 2021 | Oct. 31, 2020 | Jul. 31, 2021
Operating Lease, Percent of Facilities Leased |  |  | 82.00%
Operating Lease, Expense | $ 3,900,000 | $ 4,000,000.0 |
Operating Lease, Weighted Average Discount Rate, Percent | 4.30% |  |
Letters of Credit Outstanding, Amount | $ 750,000 |  |
Minimum [Member] | Dealership Leases [Member] |  |  |
Lessee, Operating Lease, Term of Contract (Year) |  |  | 3 years
Maximum [Member] | Dealership Leases [Member] |  |  |
Lessee, Operating Lease, Term of Contract (Year) |  |  | 5 years

X
- Definition The percent of facilities leased under operating leases. + References No definition available. + Details
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X
- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918673-209980 + Details
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X
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X
- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918638-209977 + Details
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- Definition Weighted average discount rate for operating lease calculated at point in time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(4) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971 + Details
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- Details
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