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Loss per common share (Tables)
 9 Months Ended
Sep. 30, 2012
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Basic and diluted loss per share for the three and nine months ended September 30, 2012 and 2011 respectively was as follows:
 
 
Three Months Ended
 
Nine Months Ended
 
September 30,
2012
 
September 30,
2011
 
September 30,
2012
 
September 30,
2011
Earnings per share
 

 
 

 
 

 
 

Loss available to stockholders
$
(1,259,490
)
 
$
(1,109,516
)
 
$
(5,078,148
)
 
$
(2,013,411
)
Weighted average shares outstanding - Basic and diluted
47,653,786

 
45,834,904

 
46,716,914

 
45,647,265

Basic and diluted loss per share
$
(0.03
)
 
$
(0.02
)
 
$
(0.11
)
 
$
(0.04
)
Shares underlying warrants outstanding
565,500

 
588,000

 
565,500

 
588,000

Shares underlying stock options outstanding
2,101,986

 
2,053,375

 
2,101,986

 
2,053,375

Shares underlying convertible debentures outstanding
8,818,182

 
5,681,818

 
8,818,182

 
5,681,818

 
11,485,668

 
8,323,193

 
11,485,668

 
8,323,193