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Note 12 - Earnings Per Common Share (Tables)
 12 Months Ended
Dec. 31, 2012
Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block]
   
Year ended
December 31,
2012
   
Year ended
December 31,
2011
   
Year ended
December 31,
2010
 
Numerator for basic and diluted earnings per common share:
                 
Net income for the year
 
$
4,424,142
   
$
6,170,231
   
$
2,116,948
 
Denominator for basic and diluted earnings per common share:
                       
Basic weighted average number of common shares outstanding
   
45,832,862
     
53,454,675
     
57,982,248
 
Effect of stock options
   
3,302,082
     
2,294,758
     
1,973,540
 
Diluted weighted average number of shares outstanding
   
49,134,944
     
55,749,433
     
59,955,788
 
Basic earnings per common share
 
$
0.10
   
$
0.12
   
$
0.04
 
Diluted earnings per common share
 
$
0.09
   
$
0.11
   
$
0.04