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