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Note 6 - Stock Option Plan (Tables)
 6 Months Ended
Jun. 30, 2018
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, 2018    
10,500
     $
24.50
  
Granted    
20,000
     $
37.42
  
Vested    
800
     $
32.58
  
Forfeited    
-
      
-
  
Nonvested at June 30, 2018    
29,700
     $
32.98