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Note L - Commitments and Contingencies (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Apr. 30, 2021 | Apr. 30, 2020 | Apr. 30, 2019
Letters of Credit Outstanding, Amount | $ 250,000 |  |
Lessee, Operating Lease, Liability, to be Paid, Total | 85,448,000 |  |
Operating Lease, Expense | 8,000,000.0 | $ 6,900,000 | $ 6,700,000
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability | 7,300,000 |  |
Non-cancelable [Member] |  |  |
Lessee, Operating Lease, Liability, to be Paid, Total | 25,200,000 |  |
Reasonably Assured [Member] |  |  |
Lessee, Operating Lease, Liability, to be Paid, Total | 60,200,000 |  |
Owned or Controlled by One Preferred Shareholder [Member] |  |  |
Lessee, Operating Lease, Liability, to be Paid, Total | $ 23,000,000,000 |  |
Minimum [Member] |  |  |
Lessee, Operating Lease, Term of Contract (Year) | 3 years |  |
Minimum [Member] | Dealership Leases [Member] |  |  |
Lessee, Operating Lease, Term of Contract (Year) | 3 years |  |
Maximum [Member] |  |  |
Lessee, Operating Lease, Term of Contract (Year) | 10 years |  |
Maximum [Member] | Dealership Leases [Member] |  |  |
Lessee, Operating Lease, Term of Contract (Year) | 5 years |  |

X
- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918701-209980 + 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
- 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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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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X
- Definition Amount of increase in right-of-use asset obtained in exchange for operating lease liability. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980 + Details
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