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Note 5 - Accounting for Share-based Compensation - Fair Value of Options Granted (Details) - $ / shares
3 Months Ended
Mar. 02, 2019
Mar. 03, 2018
Expected life (Year) 4 years 273 days 4 years 273 days
Weighted-average expected volatility 24.25% 23.26%
Weighted-average expected dividend yield 1.40% 1.12%
Weighted-average fair value of grants (in dollars per share) $ 9.80 $ 11.37
Minimum [Member]    
Expected volatility 24.25% 23.18%
Risk-free interest rate 2.51% 2.38%
Expected dividend yield range 1.26% 1.12%
Maximum [Member]    
Expected volatility 24.33% 23.26%
Risk-free interest rate 2.55% 2.53%
Expected dividend yield range 1.41% 1.74%