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Note 4 - Share-based Compensation - Option Pricing Assumptions (Details) - $ / shares
6 Months Ended
Jun. 06, 2017
Jun. 30, 2017
Expected volatility 29.10%  
Risk-free interest rate 1.84%  
Exercise price (in dollars per share) $ 27.05  
Expected term (in years) (Year)   5 years 292 days
Weighted-average grand date fair value (in dollars per share) $ 8.51