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Note L - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Apr. 30, 2016 | Apr. 30, 2015 | Apr. 30, 2014
Minimum [Member] |  |  |
Lessee Leasing Arrangements, Operating Leases, Renewal Term | 3 years |  |
Maximum [Member] |  |  |
Lessee Leasing Arrangements, Operating Leases, Renewal Term | 5 years |  |
Non-cancelable [Member] |  |  |
Operating Leases, Future Minimum Payments Due | $ 16,200 |  |
Reasonably Assured [Member] |  |  |
Operating Leases, Future Minimum Payments Due | 30,500 |  |
Letters of Credit Outstanding, Amount | 1,000 |  |
Operating Leases, Future Minimum Payments Due | 46,721 |  |
Operating Leases, Rent Expense | $ 6,100 | $ 5,500 | $ 5,200

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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Term of the lessee's leasing arrangement renewal, 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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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Period Type: | instant

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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Data Type: | na
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Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
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Period Type: |

X
- Details
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