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Note 7 - Accounting for Share-based Compensation - Fair Value of Options Granted (Details) - $ / shares
3 Months Ended
Feb. 29, 2020
Mar. 02, 2019
Expected life (Year) 5 years 4 years 9 months
Weighted-average expected volatility 24.29% 24.25%
Risk-free interest rate 1.50%  
Weighted-average expected dividend yield 1.36% 1.40%
Expected dividend yield range (in dollars per share) $ 9.76 $ 9.80
Minimum [Member]    
Expected volatility 24.29% 24.25%
Risk-free interest rate   2.51%
Expected dividend yield range 1.35% 1.26%
Maximum [Member]    
Expected volatility 24.30% 24.33%
Risk-free interest rate   2.55%
Expected dividend yield range 1.42% 1.41%