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Note 1 - Significant Accounting Policies (Details) - Summary of Inventory (USD $) In Thousands, unless otherwise specified | Apr. 30, 2014 | Apr. 30, 2013
--- | --- | ---
Inventory [Line Items] |  |
Inventory | $ 204,833 | $ 189,514
Gasoline [Member] |  |
Inventory [Line Items] |  |
Inventory | 95,004 | 87,262
Merchandise [Member] |  |
Inventory [Line Items] |  |
Inventory | $ 109,829 | $ 102,252

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- Definition Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration