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Accounts receivable (Tables)
 12 Months Ended
Dec. 31, 2014
Receivables [Abstract]  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
 
 
December 31
 
 
 
2014
 
2013
 
Trade accounts receivable
 
$
10,722,177
 
$
18,666,283
 
Receivable – construction project
 
 
415,305
 
 
-
 
Receivable from affiliate
 
 
49,154
 
 
53,867
 
Other accounts receivable
 
 
780,446
 
 
362,453
 
 
 
 
11,967,082
 
 
19,082,603
 
Allowance for doubtful accounts
 
 
(193,338)
 
 
(223,043)
 
 
 
$
11,773,744
 
$
18,859,560
 
Schedule Of Allowance For Doubtful Accounts Activity [Table Text Block]
The activity for the allowance for doubtful accounts consisted of:
 
 
 
December 31
 
 
 
2014
 
2013
 
Opening allowance for doubtful accounts
 
$
223,043
 
$
223,043
 
Provision for doubtful accounts
 
 
-
 
 
32,933
 
Accounts written off during the year
 
 
(29,705)
 
 
(32,933)
 
Ending allowance for doubtful accounts
 
$
193,338
 
$
223,043