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Note 5 - Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
201
8
    
201
7
  
Net income
   $
1,273,619
     $
1,231,265
  
Numerator for basic and diluted earnings per share
   $
1,273,619
     $
1,231,265
  
                 
Denominator for basic earnings per share – weighted-average shares
    
9,264,446
      
9,308,726
  
                 
Effect of dilutive securities:
                
Stock options
    
-
      
19,729
  
Restricted stock
    
365
      
2,464
  
Dilutive potential common shares
    
365
      
22,193
  
                 
Denominator for diluted earnings per share – weighted-average shares
    
9,264,811
      
9,330,919
  
                 
Basic earnings per share
   $
0.14
     $
0.13
  
Diluted earnings per share
   $
0.14
     $
0.13