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Note 9 - Basic and Diluted Earnings Per Common Share (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three months ended March 31,
 
   
2018
   
2017
 
                 
Numerator for basic and diluted earnings per common share:
               
Net income for the period
  $
3,743,692
    $
2,446,491
 
                 
Denominator for basic and diluted earnings per common share:
               
Basic weighted average number of common shares outstanding
   
10,588,718
     
10,474,647
 
Effect of outstanding stock options
   
203,895
     
301,868
 
Diluted weighted average number of shares outstanding
   
10,792,613
     
10,776,515
 
                 
Basic earnings per common share
  $
0.35
    $
0.23
 
                 
Diluted earnings per common share
  $
0.35
    $
0.23