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Note 7 - Accounting for Share-based Compensation - Fair Value of Options Granted (Details) - $ / shares
3 Months Ended 6 Months Ended
May 30, 2020
Jun. 01, 2019
May 30, 2020
Jun. 01, 2019
Expected life (Year) 5 years 4 years 9 months 5 years 4 years 9 months
Weighted-average expected volatility 24.20% 24.70% 24.29% 24.26%
Risk-free interest rate 0.38%      
Weighted-average expected dividend yield 2.34% 1.42% 1.38% 1.40%
Expected dividend yield range (in dollars per share) $ 4.48 $ 9.49 $ 9.63 $ 9.80
Minimum [Member]        
Expected volatility 24.18% 24.39% 24.18% 24.25%
Risk-free interest rate   2.17% 0.36% 2.17%
Expected dividend yield range 1.84% 1.26% 1.35% 1.26%
Maximum [Member]        
Expected volatility 24.26% 24.76% 24.30% 24.76%
Risk-free interest rate   2.31% 1.51% 2.55%
Expected dividend yield range 2.53% 1.45% 2.53% 1.45%