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Note 6 - Accounting for Share-based Compensation - Fair Value of Options Granted (Details) - $ / shares
3 Months Ended 9 Months Ended
Aug. 31, 2019
Sep. 01, 2018
Aug. 31, 2019
Sep. 01, 2018
Expected life (Year) 4 years 9 months 4 years 9 months 4 years 9 months 4 years 9 months
Weighted-average expected volatility 23.88% 23.36% 24.26% 23.30%
Expected volatility 23.88% 23.36%    
Risk-free interest rate 1.68% 2.72%    
Weighted-average expected dividend yield 1.38% 1.16% 1.40% 1.14%
Expected dividend yield range 1.38% 1.16%    
Weighted-average fair value of grants (in dollars per share) $ 9.12 $ 11.75 $ 9.80 $ 11.38
Minimum [Member]        
Expected volatility     23.88% 23.18%
Risk-free interest rate     1.68% 2.38%
Expected dividend yield range     1.26% 1.12%
Maximum [Member]        
Expected volatility     24.76% 23.58%
Risk-free interest rate     2.55% 2.90%
Expected dividend yield range     1.45% 1.24%