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Note 2 - Stock-based Compensation (Tables)
9 Months Ended
Sep. 30, 2016
Notes Tables  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
           
Weighted-
           
Weighted-
 
           
average
           
average
 
           
Exercise
           
Exercise
 
   
2016
   
Price
   
2015
   
Price
 
                                 
Outstanding, January 1
    31,949     $ 25.03       46,451     $ 27.90  
Expired
    -       -       (3,639 )     37.33  
Exercised
    -       -       (1,025 )     20.21  
                                 
Outstanding, September 30
    31,949     $ 25.03       41,787     $ 27.27  
                                 
Exercisable, September 30
    31,949     $ 25.03       41,787     $ 27.27