Accounts receivable, net

12 Months Ended

Dec. 31, 2021

Accounts receivable, net.

Accounts receivable, net

4. Accounts receivable, net

	December 31,
	2021		2020
Trade accounts receivable	$	27,409,029	$	21,422,782
Receivable from OC-BVI		40,877		62,171
Other accounts receivable		180,262		269,133
		27,630,168		21,754,086
Allowance for doubtful accounts		(280,861)		(270,110)
Accounts receivable, net	$	27,349,307	$	21,483,976

The activity for the allowance for doubtful accounts consisted of:

	December 31,
	2021		2020
Opening allowance for doubtful accounts	$	270,110	$	142,236
Provision for doubtful accounts		—		129,107
Accounts written off during the year		—		(1,233)
Recovery of accounts written off		10,751		—
Ending allowance for doubtful accounts	$	280,861	$	270,110

Significant concentrations of credit risk are disclosed in Note 18.