Accounts Receivable (Tables)

6 Months Ended

Jun. 30, 2018

Receivables [Abstract]

Schedule of Accounts, Notes, Loans and Financing Receivable [Text Block]

Accounts receivable, net, consists of the following:

	June 30, 2018			December 31, 2017
Accounts receivable	$	8,138,078		$	8,181,879
Allowances for doubtful accounts	(61,182		)	(56,291		)
	$	8,076,896		$	8,125,588

The company maintains allowances for doubtful accounts for estimated losses resulting from the inability of its customers to make required payments.  The allowances for doubtful accounts are determined using a combination of factors, including the length of time the receivables are outstanding, the current business environment, and historical experience. The company also has notes receivables with certain customers, which are included in "Accounts receivable, net" in the company's consolidated balance sheets.  One such customer, with a combined note and accounts receivable balance of approximately $24,252 and $24,600 as of June 30, 2018 and December 31, 2017, respectively, became delinquent on its repayment of the note during the fourth quarter of 2016.  The company believes that it has adequately reserved for potential losses; however, it is possible that it could incur a loss in excess of the reserve.