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Note 6 - Disclosure of Compensation Related Costs, Share Based Payments - Stock Option Activity (Details) (USD $)
 3 Months Ended
Jul. 31, 2014
Outstanding at July 31, 2014 (in shares) 645,124
Employee Stock Option [Member]
  
Outstanding at April 30, 2014 (in shares) 712,024
Weighted average exercise price outstanding at April 30, 2014 (in dollars per share) $ 36.73
Exercised (in shares) (66,900)
Weighted average exercise price exercised (in dollars per share) $ 40.27
Outstanding at July 31, 2014 (in shares) 645,124
Weighted average exercise price outstanding at July 31, 2014 (in dollars per share) $ 36.36