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Accounts receivable, net
12 Months Ended
Dec. 31, 2018
Receivables [Abstract]  
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]
5. Accounts receivable, net
 
 
 
December 31,
 
 
 
2018
 
 
2017
 
Trade accounts receivable
 
$
22,331,720
 
 
$
13,341,438
 
Receivable from OC-BVI
 
 
46,600
 
 
 
123,807
 
Other accounts receivable
 
 
2,008,677
 
 
 
1,380,735
 
 
 
 
24,386,997
 
 
 
14,845,980
 
Allowance for doubtful accounts
 
 
(158,902
)
 
 
(158,902
)
Accounts receivable, net
 
$
24,228,095
 
 
$
14,687,078
 
 
The activity for the allowance for doubtful accounts consisted of:
 
 
 
December 31,
 
 
 
2018
 
 
2017
 
Opening allowance for doubtful accounts
 
$
158,902
 
 
$
193,338
 
Provision for doubtful accounts
 
 
-
 
 
 
-
 
Accounts written off during the year
 
 
-
 
 
 
(34,436
)
Ending allowance for doubtful accounts
 
$
158,902
 
 
$
158,902
 
 
Significant concentrations of credit risk are disclosed in Note 21.