Note 4 - Investment Securities (Tables)
 3 Months Ended
May. 30, 2015
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities [Table Text Block]
(in millions)
 
May 30,
2015
   
February 28,
2015
 
Available-for-sale securities:
           
Long term
  $ 47.9     $ 47.9  
                 
Trading securities:
               
Long term
    52.6       49.2  
                 
Held-to-maturity securities:
               
Short term
    76.9       110.0  
Total investment securities
  $ 177.4     $ 207.1