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8. Stock Plans (Tables)
12 Months Ended
Dec. 31, 2017
Compensation Related Costs [Abstract]  
Option Transaction
Options    Shares     Weighted Average Exercise Price   Weighted Average Remaining Contractual Term
Outstanding at December 31, 2016     50,000     $ 204.76    
Granted     20,000     $ 501.03    
Exercised     (50,000 )   $ 204.76    
Outstanding at December 31, 2017     20,000     $ 501.03   5.3 years
Exercisable at December 31, 2017     --       --   --
Weighted Average Assumptions for Options Granted
  2017 2016 2015
Risk-free interest rate 2.13% -- --
Dividend yield 0.85% -- --
Volatility factor 25.45% -- --
Expected life 5 years -- --
Restricted Stock Activity
Nonvested Shares   Shares Weighted Average Award Date Fair Value Per Share
Restricted stock at December 31, 2016   1,500  $ 228.08
Granted in 2017   5,900           $ 445.47
Vested in 2017   (1,500) $ 228.08
Restricted stock at December 31, 2017   5,900  $ 445.47
Changes in Stock Units
Nonvested Stock Units   Restricted Stock Units     Weighted Average Award Date Fair Value Per Unit     Director’s Stock Units     Weighted Average Award Date Fair Value Per Unit  
Nonvested at December 31, 2016     9,388     $ 258.69       --        
Granted     1,420     $ 616.41       11     $ 535.07  
Vested     (4,608 )   $ 230.90       (11 )   $ 535.07  
Nonvested at December 31, 2017     6,200     $ 361.28       --          
Unrecognized Compensation Cost
    Unrecognized Compensation Cost    

Weighted Average

Remaining Years in Amortization Period

 
Stock options   $ 2,246,000       4.3  
Restricted stock     2,264,000       4.3  
Restricted stock units     1,114,000       3.8  
Total   $ 5,624,000