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Accounts receivable
 12 Months Ended
Dec. 31, 2015
Receivables [Abstract]  
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]
4. Accounts receivable
 
 
 
December 31
 
 
 
2015
 
2014
 
Trade accounts receivable
 
$
8,235,514
 
$
10,722,177
 
Receivable – construction project
 
 
521,250
 
 
415,305
 
Receivable from OC-BVI
 
 
45,118
 
 
49,154
 
Other accounts receivable
 
 
920,472
 
 
780,446
 
 
 
 
9,722,354
 
 
11,967,082
 
Allowance for doubtful accounts
 
 
(193,338)
 
 
(193,338)
 
 
 
$
9,529,016
 
$
11,773,744
 
 
The activity for the allowance for doubtful accounts consisted of:
 
 
 
December 31
 
 
 
2015
 
2014
 
Opening allowance for doubtful accounts
 
$
193,338
 
$
223,043
 
Provision for doubtful accounts
 
 
-
 
 
-
 
Accounts written off during the year
 
 
-
 
 
(29,705)
 
Ending allowance for doubtful accounts
 
$
193,338
 
$
193,338
 
 
Significant concentrations of credit risk are disclosed in Note 20.