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Note 2 - Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2014
Disclosure Text Block Supplement [Abstract]  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
           

Weighted-average

           

Weighted-average

 
   

2014

    Exercise Price    

2013

    Exercise Price  
                                 

Outstanding, January 1

    58,581     $ 28.38       79,693     $ 26.81  

Exercised

    (1,735 )     30.45       (21,112 )     24.11  

Forfeited

    (907 )     27.35       -       -  
                                 

Outstanding, September 30

    55,939       28.34       58,581       26.38  
                                 

Exercisable, September 30

    55,939       28.34       58,581       26.38