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Note 9 - Equity-based Compensation (Tables)
3 Months Ended
Mar. 31, 2016
Stock Appreciation Rights (SARs) [Member]  
Notes Tables  
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block]
 
 
201
6
 
Expected volatility
    24.00
%
Risk-free interest rate
    1.75
%
Expected term (in years)
    6.25  
Expected dividend yield
    1.45
%
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
 
 
 
 
 
 
Weighted Average
 
 
 
 
 
 
 
Grant Date
 
 
 
Restricted
 
 
Fair Value
 
 
 
Stock
 
 
Per Share
 
Unvested as of January 1, 2016
    39,744     $ 383.18  
Granted
    6,245     $ 433.66  
Unvested as of March 31, 2016
    45,989          
Schedule of Share-based Compensation, Stock Appreciation Rights Award Activity [Table Text Block]
 
 
Stock Appreciation
Rights
 
 
Weighted Average Exercise
Price
 
 
Weighted Average Fair
Value
 
 
Aggregate Intrinsic
Value
 
 
Weighted Average Remaining Contractual
Term (in years)
 
Outstanding as of December 31, 2015
    135,600     $ 422.31     $ 87.22     $ -       9.7  
Granted
    -       -       -       -       -  
Outstanding as of March 31, 2016
    135,600     $ 422.31     $ 87.22     $ -       9.4  
                                         
Vested and exercisable as of March 31, 2016
    -     $ -     $ -     $ -       -