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Note 9 - Accounting for Share-based Compensation - Fair Value of Options Granted (Details) - $ / shares
12 Months Ended
Nov. 30, 2019
Dec. 01, 2018
Dec. 02, 2017
Expected life (Year) 4 years 9 months 4 years 9 months 4 years 9 months
Weighted-average expected volatility 24.26% 23.31% 24.17%
Weighted-average expected dividend 1.40% 1.14% 1.07%
Expected dividend yield range (in dollars per share) $ 9.76 $ 11.38 $ 11.49
Minimum [Member]      
Expected volatility range 23.88% 23.18% 23.48%
Risk-free interest rate 1.34% 2.38% 1.80%
Expected dividend yield range 1.25% 1.12% 1.02%
Maximum [Member]      
Expected volatility range 24.76% 23.58% 24.88%
Risk-free interest rate 2.55% 2.95% 1.99%
Expected dividend yield range 1.45% 1.24% 1.16%