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Note 3 - Acquisitions (Details) - Allocation of the Purchase Price for Acquisitions (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Apr. 30, 2014 | Apr. 30, 2013 | Apr. 30, 2012
Note 3 - Acquisitions (Details) - Allocation of the Purchase Price for Acquisitions [Line Items] |  |  |
Goodwill | $ 120,406 | $ 114,791 |
Total consideration paid | 31,584 | 29,527 | 39,444
In Fiscal Year 2014 [Member] |  |  |
Note 3 - Acquisitions (Details) - Allocation of the Purchase Price for Acquisitions [Line Items] |  |  |
Inventories | 1,622 |  |
Property and equipment | 24,469 |  |
Total assets | 26,091 |  |
Accrued expenses | 122 |  |
Total liabilities | 122 |  |
Net tangible assets acquired | 25,969 |  |
Goodwill | 5,615 |  |
Total consideration paid | $ 31,584 |  |

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- Definition Amount of assets acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Amount of other liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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