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Note 5 - Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
 
 
Three Months
Ended
 
 
Six Months Ended
 
 
 
June 30,
 
 
June 30,
 
 
 
2017
 
 
2016
 
 
2017
 
 
2016
 
Net income
  $
1,027,732
     $
1,820,915
     $
2,258,997
     $
3,341,912
  
Numerator for basic and diluted earnings per share
    
1,027,732
      
1,820,915
      
2,258,997
      
3,341,912
  
                                 
Denominator for basic EPS: weighted-average shares
    
9,225,960
      
9,209,446
      
9,212,846
      
9,418,645
  
                                 
Effect of dilutive securities:
                                
Stock options
    
-
      
18,495
      
9,810
      
18,975
  
Restricted stock
    
3,169
      
-
      
2,818
      
-
  
Dilutive potential common shares
    
3,169
      
18,495
      
12,628
      
18,975
  
Denominator for diluted EPS-weighted-average shares
    
9,229,129
      
9,227,941
      
9,225,474
      
9,437,620
  
                                 
Basic earnings per share
   $
0.11
     $
0.19
     $
0.24
     $
0.35
  
Diluted earnings per share
   $
0.11
     $
0.19
     $
0.24
     $
0.35