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Note K - Stock Based Compensation Plan (Details) - Stock Option Activity (USD $) | 12 Months Ended |  | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2013 | Apr. 30, 2012 | Apr. 30, 2011 | Apr. 30, 2013 Minimum [Member] | Apr. 30, 2012 Minimum [Member] | Apr. 30, 2010 Minimum [Member] | Apr. 30, 2013 Maximum [Member] | Apr. 30, 2012 Maximum [Member] | Apr. 30, 2011 Maximum [Member]
Note K - Stock Based Compensation Plan (Details) - Stock Option Activity [Line Items] |  |  |  |  |  |  |  |  |
Number of Shares (in Shares) | 1,118,250 | 1,133,147 | 1,110,397 |  |  |  |  |  |
Exercise Price per Share Lower Range Limit (in Dollars) |  |  |  | $ 11.83 | $ 6.59 | $ 6.59 |  |  |
Exercise Price per Share Upper Range Limit (in Dollars) |  |  |  |  |  |  | 45.72 | 24.47 | 24.47
Proceeds on Exercise | $ 22,881,000 | $ 21,897,000 | $ 21,366,000 |  |  |  |  |  |
Weighted Average Exercise Price per Share | $ 20.46 | $ 19.32 | $ 19.24 |  |  |  |  |  |
Number of Shares (in Shares) | 40,000 | 73,750 | 23,750 |  |  |  |  |  |
Exercise Price per Share Lower Range Limit (in Dollars) |  |  |  | 44.14 | 24.69 |  |  |  |
Exercise Price per Share Upper Range Limit (in Dollars) |  |  |  |  |  |  | 45.46 | 45.72 | 22.87
Proceeds on Exercise | $ 1,801,000 | $ 2,355,000 | $ 543,000 |  |  |  |  |  |
Weighted Average Exercise Price per Share | $ 45.02 | $ 31.93 | $ 22.87 |  |  |  |  |  |
Number of Shares (in Shares) | (35,750) | (88,647) |  |  |  |  |  |  |
Exercise Price per Share Lower Range Limit (in Dollars) |  |  |  | 11.83 | 6.59 |  |  |  |
Exercise Price per Share Upper Range Limit (in Dollars) |  |  |  |  |  |  | 23.34 | 24.69 |
Proceeds on Exercise | $ (790,000) | $ (1,371,000) |  |  |  |  |  |  |
Weighted Average Exercise Price per Share | $ 22.13 | $ 15.46 |  |  |  |  |  |  |
Expired (in Shares) |  |  | (1,000) |  |  |  |  |  |
Expired |  |  |  |  |  |  |  |  | $ 11.62
Expired (in Dollars) |  |  | (12,000) |  |  |  |  |  |
Expired |  |  | $ 11.62 |  |  |  |  |  |
Number of Shares (in Shares) | 1,122,500 | 1,118,250 | 1,133,147 |  |  |  |  |  |
Exercise Price per Share Lower Range Limit (in Dollars) |  |  |  | 11.90 | 11.83 | 6.59 |  |  |
Exercise Price per Share Upper Range Limit (in Dollars) |  |  |  |  |  |  | $ 45.72 | $ 45.72 | $ 24.47
Proceeds on Exercise | $ 23,892,000 | $ 22,881,000 | $ 21,897,000 |  |  |  |  |  |
Weighted Average Exercise Price per Share | $ 21.28 | $ 20.46 | $ 19.32 |  |  |  |  |  |

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