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Note 7 - Accounting for Share-based Compensation - Fair Value of Options Granted (Details) - $ / shares
3 Months Ended 9 Months Ended
Aug. 29, 2020
Aug. 31, 2019
Aug. 29, 2020
Aug. 31, 2019
Expected life (Year) 5 years 4 years 9 months 5 years 4 years 9 months
Weighted-average expected volatility 29.91% 23.88% 24.32% 24.26%
Expected volatility   23.88%    
Risk-free interest rate 0.28% 1.68%    
Weighted-average expected dividend yield 1.46% 1.38% 1.38% 1.40%
Expected dividend yield range   1.38%    
Expected dividend yield range (in dollars per share) $ 9.92 $ 9.12 $ 9.63 $ 9.80
Minimum [Member]        
Expected volatility 29.35%   24.18% 23.88%
Risk-free interest rate     0.21% 1.68%
Expected dividend yield range 1.43%   1.35% 1.26%
Maximum [Member]        
Expected volatility 30.99%   30.99% 24.76%
Risk-free interest rate     1.51% 2.55%
Expected dividend yield range 1.48%   2.53% 1.45%