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Note 3 - Acquisitions (Tables) | 12 Months Ended
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Apr. 30, 2014
Business Combinations [Abstract] |
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] |
Assets acquired: |  |  |  |
Inventories |  | $ | 1,622 |
Property and equipment |  |  | 24,469 |
Total assets |  |  | 26,091 |
Liabilities assumed: |  |  |  |
Accrued expenses |  |  | 122 |
Total liabilities |  |  | 122 |
Net tangible assets acquired |  |  | 25,969 |
Goodwill |  |  | 5,615 |
Total consideration paid |  | $ | 31,584 |
Business Acquisition, Pro Forma Information [Table Text Block] |
|  | Years Ended April 30, |
|  | 2014 |  |  | 2013 |
Total revenue |  | $ | 7,885,634 |  |  | $ | 7,362,816 |
Net income |  | $ | 127,615 |  |  | $ | 105,699 |
Net income per common share |  |  |  |  |  |  |  |
Basic |  | $ | 3.32 |  |  | $ | 2.76 |
Diluted |  | $ | 3.28 |  |  | $ | 2.73 |

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- Definition Tabular disclosure of pro forma results of operations for a material business acquisition or series of individually immaterial business acquisitions that are material in the aggregate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition Tabular disclosure of the amounts recognized as of the acquisition date for each major class of assets acquired and liabilities assumed. May include but not limited to the following: (a) acquired receivables; (b) contingencies recognized at the acquisition date; and (c) the fair value of noncontrolling interests in the acquiree. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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