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Note 5 - Stock Option Plan (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
      Weighted
    Number   Average
    of   Grant Date
    Shares   Fair Value
         
Nonvested at January 1, 2017    
14,000
     $
24.50
  
Granted    
-
      
-
  
Vested    
3,500
     $
24.50
  
Forfeited    
-
      
-
  
                 
Nonvested at September 30, 2017    
10,500
     $
24.50