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Note 6 - Stock-based Compensation Plan (Tables)
 6 Months Ended
Jun. 30, 2019
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, 2019    
24,900
 
   $
34.10
 
Granted    
9,750
 
    
52.09
 
Vested    
-
 
    
-
 
Forfeited    
-
 
    
-
 
                 
Nonvested at June 30, 2019    
34,650
 
   $
39.16