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Note B - Summary of Significant Accounting Policies (Details) - Sales (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Apr. 30, 2013 | Apr. 30, 2012 | Apr. 30, 2011
Revenue from External Customer [Line Items] |  |  |
Sales | $ 415,740 | $ 386,857 | $ 341,859
Sales - Used Autos [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Sales | 368,674 | 340,368 | 300,107
Wholesales - Third Party [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Sales | 19,718 | 21,910 | 19,601
Service Contract Sales [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Sales | 14,594 | 13,451 | 12,042
Payment Protection Plan Revenue [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Sales | $ 12,754 | $ 11,128 | $ 10,109

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- Definition Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(a)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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