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Note 9 - Accounting for Share-based Compensation - Fair Value of Options Granted (Details) - $ / shares
12 Months Ended
Dec. 01, 2018
Dec. 02, 2017
Dec. 03, 2016
Maximum [Member]      
Expected life (Year) 4 years 273 days 4 years 273 days 4 years 273 days
Weighted-average expected volatility 23.31% 24.17% 28.95%
Expected volatility range 23.58% 24.88% 29.23%
Risk-free interest rate 2.95% 1.99% 1.44%
Weighted-average expected dividend 1.14% 1.07% 1.54%
Expected dividend yield range 1.24% 1.16% 1.56%
Weighted-average fair value of grants (in dollars per share) $ 11.38 $ 11.49 $ 7.75
Minimum [Member]      
Expected volatility range 23.18% 23.48% 24.86%
Risk-free interest rate 2.38% 1.80% 0.96%
Expected dividend yield range 1.12% 1.02% 1.20%