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Note 3 - Stock-Based Compensation (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Aug. 31, 2014
Note 3 - Stock-Based Compensation (Details) [Line Items]  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized (in Dollars) $ 2.2
Employee Stock Option [Member]
 
Note 3 - Stock-Based Compensation (Details) [Line Items]  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year 292 days
Restricted Stock Units (RSUs) [Member]
 
Note 3 - Stock-Based Compensation (Details) [Line Items]  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year 219 days