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Note 4 - Fair Value of Financial Instruments and Long Term Debt (Details) - Long-term Debt at Carrying Amount (Parentheticals) | 12 Months Ended
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Apr. 30, 2014 | Apr. 30, 2013
Minimum [Member] | Capital Lease Obligations [Member] |  |
Note 4 - Fair Value of Financial Instruments and Long Term Debt (Details) - Long-term Debt at Carrying Amount (Parentheticals) [Line Items] |  |
Discount Rate Of Capitalized Lease Obligations | 5.22% | 5.22%
Maximum [Member] | Capital Lease Obligations [Member] |  |
Note 4 - Fair Value of Financial Instruments and Long Term Debt (Details) - Long-term Debt at Carrying Amount (Parentheticals) [Line Items] |  |
Discount Rate Of Capitalized Lease Obligations | 7.09% | 7.09%
Senior Notes 5.72% [Member] |  |
Note 4 - Fair Value of Financial Instruments and Long Term Debt (Details) - Long-term Debt at Carrying Amount (Parentheticals) [Line Items] |  |
Stated Interest Rate | 5.72% | 5.72%
Senior Notes 5.22% [Member] |  |
Note 4 - Fair Value of Financial Instruments and Long Term Debt (Details) - Long-term Debt at Carrying Amount (Parentheticals) [Line Items] |  |
Stated Interest Rate | 5.22% | 5.22%
Senior Notes Series A, 3.67% [Member] |  |
Note 4 - Fair Value of Financial Instruments and Long Term Debt (Details) - Long-term Debt at Carrying Amount (Parentheticals) [Line Items] |  |
Stated Interest Rate | 3.67% |
Senior Notes Series B, 3.75% [Member] |  |
Note 4 - Fair Value of Financial Instruments and Long Term Debt (Details) - Long-term Debt at Carrying Amount (Parentheticals) [Line Items] |  |
Stated Interest Rate | 3.75% |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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