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Accounts receivable
 12 Months Ended
Dec. 31, 2013
Receivables [Abstract]  
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]
4. Accounts receivable
 
 
 
December 31,
 
 
 
2013
 
2012
 
Trade accounts receivable
 
$
18,666,283
 
$
12,098,566
 
Receivable from affiliate
 
 
53,867
 
 
110,544
 
Other accounts receivable
 
 
362,453
 
 
530,399
 
 
 
 
19,082,603
 
 
12,739,509
 
Allowance for doubtful accounts
 
 
(223,043)
 
 
(223,043)
 
 
 
$
18,859,560
 
$
12,516,466
 
 
The activity for the allowance for doubtful accounts consisted of:
 
 
 
Year ended December 31,
 
 
 
2013
 
2012
 
Opening allowance for doubtful accounts
 
$
223,043
 
$
160,134
 
Provision for doubtful accounts
 
 
32,933
 
 
62,909
 
Accounts written off during the year
 
 
(32,933)
 
 
-
 
Ending allowance for doubtful accounts
 
$
223,043
 
$
223,043
 
 
Significant concentrations of credit risk are disclosed in Note 20.