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Note 1 - Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Apr. 30, 2014 | Apr. 30, 2013 | Apr. 30, 2012
Note 1 - Significant Accounting Policies (Details) [Line Items] |  |  |
Number of Stores | 1,808 |  |
Number of States in which Entity Operates | 14 |  |
Population Of Communities | 5,000 |  |
Excess of Replacement or Current Costs over Stated LIFO Value | $ 48,777 | $ 44,792 |
Goodwill | 120,406 | 114,791 |
Asset Impairment Charges | 2,542 | 3,680 | 226
Excise Taxes Collected | 646,000 | 596,000 | 527,000
Asset Retirement Obligation in Other Assets Net of Amortization | 8,391 | 8,011 |
Asset Retirement Obligation, Liabilities Incurred | 12,854 | 12,176 |
Self Insurance Reserve | $ 28,429 | $ 24,039 |
Number of Operating Segments | 1 |  |
Number of Reportable Segments | 1 |  |
Gasoline [Member] | Sales Revenue, Goods, Net [Member] |  |  |
Note 1 - Significant Accounting Policies (Details) [Line Items] |  |  |
Concentration Risk, Percentage | 71.00% |  |
Grocery and Other Merchandise [Member] | Sales Revenue, Goods, Net [Member] |  |  |
Note 1 - Significant Accounting Policies (Details) [Line Items] |  |  |
Concentration Risk, Percentage | 20.00% |  |
Prepared Food and Fountain [Member] | Sales Revenue, Goods, Net [Member] |  |  |
Note 1 - Significant Accounting Policies (Details) [Line Items] |  |  |
Concentration Risk, Percentage | 9.00% |  |

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