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Note 5 - Disclosure of Compensation Related Costs, Stock Based Payments (Details) - Stock Option Activity (USD $)
 3 Months Ended
Jul. 31, 2013
Apr. 29, 2013
Note 5 - Disclosure of Compensation Related Costs, Stock Based Payments (Details) - Stock Option Activity [Line Items]    
Outstanding April 30, 2013 (in Dollars per share)   $ 34.64
Outstanding July 31, 2013 (in Dollars per share) $ 35.28 $ 34.64
Granted (in Dollars per share) $ 0  
Exercised (in Dollars per share) $ 21.94  
Forfeited (in Dollars per share) $ 0  
Restricted Stock Units (RSUs) [Member]
    
Note 5 - Disclosure of Compensation Related Costs, Stock Based Payments (Details) - Stock Option Activity [Line Items]    
Outstanding April 30, 2013   113,196,000
Outstanding July 31, 2013 190,846,000 113,196,000
Granted 77,650,000  
Exercised 0  
Forfeited 0  
Employee Stock Option [Member]
    
Note 5 - Disclosure of Compensation Related Costs, Stock Based Payments (Details) - Stock Option Activity [Line Items]    
Outstanding April 30, 2013   854,809,000
Outstanding July 31, 2013 813,809,000 854,809,000
Granted 0  
Exercised 41,000,000  
Forfeited 0