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Note J - Commitments and Contingencies (Details Textual) - USD ($) | 6 Months Ended
--- | ---
Oct. 31, 2020 | Oct. 31, 2019
Operating Lease, Percent of Facilities Leased | 85.00% |
Operating Lease, Expense | $ 4,000,000.0 | $ 3,500,000
Operating Lease, Weighted Average Discount Rate, Percent | 4.34% |
Letters of Credit Outstanding, Amount | $ 250,000 |
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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Balance Type: | na
Period Type: | instant

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=121609121&loc=SL77918673-209980 + Details
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X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- 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=121603541&loc=SL77918638-209977 + Details
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X
- 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=121609121&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=121568110&loc=SL77918982-209971 + Details
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- Details
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- Details
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- Details
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