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Note 9 - Basic and Diluted Earnings Per Common Share (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three months ended September 30,
    
Nine months ended September 30,
  
   
2017
    
2016
    
2017
    
2016
  
                                 
Numerator for basic and diluted earnings per common share:
                                
Net income for the period
   $
3,439,266
     $
4,741,279
     $
11,127,241
     $
13,250,303
  
                                 
Denominator for basic and diluted earnings per common share:
                                
Basic weighted average number of common shares outstanding
    
10,564,311
      
10,432,763
      
10,522,841
      
10,549,056
  
Effect of outstanding stock options
    
221,031
      
186,242
      
262,209
      
187,719
  
Diluted weighted average number of shares outstanding
    
10,785,342
      
10,619,005
      
10,785,050
      
10,736,775
  
                                 
Basic earnings per common share
   $
0.33
     $
0.45
     $
1.06
     $
1.26
  
                                 
Diluted earnings per common share
   $
0.32
     $
0.45
     $
1.03
     $
1.23