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Note 6 - Net Income Per Common Share (Tables) | 12 Months Ended
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Apr. 30, 2014
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Years ended April 30, |
|  | 2014 |  |  | 2013 |  |  | 2012 |
Basic |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 126,820 |  |  | $ | 103,814 |  |  | $ | 114,694 |
Weighted average shares outstanding-basic |  |  | 38,457,680 |  |  |  | 38,297,083 |  |  |  | 38,068,001 |
Basic earnings per common share |  | $ | 3.30 |  |  | $ | 2.71 |  |  | $ | 3.01 |
Diluted |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 126,820 |  |  | $ | 103,814 |  |  | $ | 114,694 |
Weighted-average shares outstanding-basic |  |  | 38,457,680 |  |  |  | 38,297,083 |  |  |  | 38,068,001 |
Plus effect of stock options and restricted stock units |  |  | 410,726 |  |  |  | 322,993 |  |  |  | 323,703 |
Weighted-average shares outstanding-diluted |  |  | 38,868,406 |  |  |  | 38,620,076 |  |  |  | 38,391,704 |
Diluted earnings per common share |  | $ | 3.26 |  |  | $ | 2.69 |  |  | $ | 2.99 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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