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Note L - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2016
Letters of Credit Outstanding, Amount | $ 1,000 |  |
Operating Leases, Future Minimum Payments Due, Total | 50,516 |  |
Operating Leases, Rent Expense, Total | 6,200 | $ 6,200 | $ 6,100
Non-cancelable [Member] |  |  |
Operating Leases, Future Minimum Payments Due, Total | 14,300 |  |
Reasonably Assured [Member] |  |  |
Operating Leases, Future Minimum Payments Due, Total | 36,200 |  |
Owned or Controlled by One Preferred Shareholder [Member] |  |  |
Operating Leases, Future Minimum Payments Due, Total | $ 14,600 |  |
Minimum [Member] |  |  |
Lessee, Operating Lease, Term of Contract | 3 years |  |
Maximum [Member] |  |  |
Lessee, Operating Lease, Term of Contract | 5 years |  |

X
- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + 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=77888426&loc=SL77918673-209980 + Details
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X
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X
- Definition Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
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