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Note 9 - Basic and Diluted Earnings Per Common Share (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three months ended June 30,
 
 
 
 
  
Six months ended June 30,
 
 
 
 
   
2017
    
2016
    
2017
    
2016
  
                                 
Numerator for basic and diluted earnings per common share:
                                
Net income for the period
   $
5,241,484
     $
4,070,786
     $
7,687,975
     $
8,509,024
  
                                 
Denominator for basic and diluted earnings per common share:
                                
Basic weighted average number of common shares outstanding
    
10,528,219
      
10,541,659
      
10,501,407
      
10,607,843
  
Effect of outstanding stock options
    
264,812
      
192,201
      
284,278
      
189,615
  
Diluted weighted average number of shares outstanding
    
10,793,031
      
10,733,860
      
10,785,685
      
10,797,458
  
                                 
Basic earnings per common share
   $
0.50
     $
0.39
     $
0.73
     $
0.80
  
                                 
Diluted earnings per common share
   $
0.49
     $
0.38
     $
0.71
     $
0.79