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Note 4 - Share-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2012
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
  2012   2011
                       
Expected dividend yield at date of grant
  2.63
to
3.98%       2.35
to
2.55%  
Expected stock price volatility
  29.10
to
31.70%       28.70
to
32.00%  
Risk-free interest rate
  0.56
to
1.15%       1.87
to
2.14%  
Expected life of options (in years)
  4
to
6       4
to
6  
Schedule of Share-based Compensation, Activity [Table Text Block]
   
Number of
Options
   
Weighted Average Exercise
Price
   
Weighted Average Remaining Contractual Terms (Years)
   
Aggregate Intrinsic
Value
(In thousands)
 
Outstanding at December 31, 2011
    769,401     $ 25.73       --       --  
Granted
    79,630     $ 45.28       --       --  
Exercised
    (116,358 )   $ 19.07       --       --  
Cancelled
    (107,505 )   $ 26.65       --       --  
Outstanding at June 30, 2012
    625,168     $ 29.30       6.62     $ 14,411  
Exercisable at June 30, 2012
    354,166     $ 24.82       5.42     $ 9,749  
Schedule of Nonvested Share Activity [Table Text Block]
   
Shares Outstanding
   
Weighted Average Grant Date Fair Value Per Share
 
Outstanding at December 31, 2011
    30,002     $ 30.57  
Granted
    7,823     $ 38.35  
Vested
    (6,441 )   $ 24.22  
Forfeited
     (7,119 )   $ 32.31  
Outstanding at June 30, 2012
    24,265     $ 34.26