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Note 4 - Investment Securities (Tables)
 12 Months Ended
Feb. 25, 2017
Notes Tables  
Marketable Securities [Table Text Block]
(in millions)   February 25,
2017		   February 27,
2016
Available-for-sale securities:                
Long term   $
19.3
     $
19.8
  
                 
Trading securities:                
Long term    
70.3
      
51.5
  
                 
Held-to-maturity securities:                
Short term    
-
      
86.2
  
Total investment securities   $
89.6
     $
157.5