Accounts Receivable

12 Months Ended

Dec. 31, 2017

Receivables [Abstract]

Accounts Receivable

3.       Accounts Receivable

	2017			2016
Accounts receivable	$	2,145,803		$	3,044,652
Allowances for doubtful accounts		(40,332	)		(36,499	)
	$	2,105,471		$	3,008,153