Accounts Receivable

12 Months Ended

Dec. 31, 2012

Receivables [Abstract]

Accounts Receivable [Text Block]

Accounts Receivable

Accounts receivable, net, consists of the following at December 31:

	2012			2011
Accounts receivable	$	4,978,136		$	4,530,242
Allowances for doubtful accounts	(54,238		)	(48,125		)
Accounts receivable, net	$	4,923,898		$	4,482,117

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.