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Note 5 - Disclosure of Compensation Related Costs, Stock Based Payments (Details) - Stock Option Activity (Employee Stock Option [Member], USD $)
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9 Months Ended |
|---|---|
|
Jan. 31, 2014
|
|
|
Employee Stock Option [Member]
|
|
| Note 5 - Disclosure of Compensation Related Costs, Stock Based Payments (Details) - Stock Option Activity [Line Items] | |
| Outstanding at April 30, 2013 | 854,809 |
| Outstanding at April 30, 2013 (in Dollars per share) | $ 34.64 |
| Outstanding at January 31, 2014 | 731,374 |
| Outstanding at January 31, 2014 (in Dollars per share) | $ 36.38 |
| Granted | 0 |
| Granted (in Dollars per share) | $ 0 |
| Exercised | (121,435) |
| Exercised (in Dollars per share) | $ 23.98 |
| Forfeited | (2,000) |
| Forfeited (in Dollars per share) | $ 44.39 |