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Note 7 - Accounting for Share-based Compensation (Tables)
9 Months Ended
Aug. 29, 2020
Notes Tables  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value [Table Text Block]
  

Three Months Ended

  

Nine Months Ended

 
  

August 29, 2020

  

August 31, 2019

  

August 29, 2020

  

August 31, 2019

 

Expected life (in years)

  5.00   4.75   5.00    4.75  

Weighted-average expected volatility

  29.91%   23.88%   24.32%    24.26%  

Expected volatility

 29.35%-30.99%  23.88%  24.18%-30.99%  23.88%-24.76% 

Risk-free interest rate

  0.28%   1.68%  0.21%-1.51%  1.68%-2.55% 

Weighted-average expected dividend yield

  1.46%   1.38%   1.38%    1.40%  

Expected dividend yield range

 1.43%-1.48%  1.38%  1.35%-2.53%  1.26%-1.45% 

Weighted-average fair value of grants

  $9.92   $9.12   $9.63    $9.80  
Share-based Payment Arrangement, Option, Activity [Table Text Block]
      

Average

 
  

Options

  

Exercise Price

 

Outstanding at November 30, 2019

  5,060,310  $46.04 

Granted

  1,052,968   47.70 

Exercised

  (227,421)  28.95 

Forfeited or cancelled

  (164,697)  49.10 

Outstanding at August 29, 2020

  5,721,160  $46.94 
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
          

Weighted-

 
      

Weighted-

  

Average

 
      

Average

  

Remaining

 
      

Grant

  

Contractual

 
      

Date Fair

  

Life

 
  

Units

  

Value

  

(in Years)

 

Nonvested at November 30, 2019

  487,997  $46.56   0.8 

Granted

  210,294   47.71   2.7 

Vested

  (208,116)  47.85   - 

Forfeited

  (49,483)  47.60   0.4 

Nonvested at August 29, 2020

  440,692  $46.39   1.0 
Schedule of Deferred Compensation Arrangement with Individual, Share-based Payments [Table Text Block]
  

Non-employee

         
  

Directors

  

Employees

  

Total

 

Units outstanding November 30, 2019

  525,660   36,664   562,324 

Participant contributions

  35,851   15,786   51,637 

Company match contributions

  3,585   1,579   5,164 

Payouts

  (111,436)  (12,536)  (123,972)

Units outstanding August 29, 2020

  453,660   41,493   495,153