Accounts receivable, net

12 Months Ended

Dec. 31, 2019

Accounts receivable, net

Accounts receivable, net

5. Accounts receivable, net

	December 31,
	2019		2018
Trade accounts receivable	$	23,138,736	$	22,331,720
Receivable from OC-BVI		10,808		46,600
Other accounts receivable		222,381		242,799
		23,371,925		22,621,119
Allowance for doubtful accounts		(142,236)		(158,902)
Accounts receivable, net	$	23,229,689	$	22,462,217

The activity for the allowance for doubtful accounts consisted of:

	December 31,
	2019		2018
Opening allowance for doubtful accounts	$	158,902	$	158,902
Provision for doubtful accounts		—		—
Accounts written off during the year		(16,666)		—
Ending allowance for doubtful accounts	$	142,236	$	158,902

Significant concentrations of credit risk are disclosed in Note 21.