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Concentration of Credit Risk (Tables)

9 Months Ended

Sep. 30, 2017

Risks and Uncertainties [Abstract]

Schedules of Concentration of Risk, by Risk Factor [Table Text Block]

Sales to these customers for the three months ended September 30, 2017 and 2016 are as follows:

		Three Months Ended						Three Months Ended
		September 30, 2017						September 30, 2016
					% of Net						% of Net
Customer		Net Sales			Sales			Net Sales			Sales
Customer A		$	3,195,000			24.2	%	$	3,088,000			22.9	%
Customer B		$	2,283,000			17.3	%	$	3,070,000			22.8	%

		Nine Months Ended						Nine Months Ended
		September 30, 2017						September 30, 2016
					% of Net						% of Net
Customer		Net Sales			Sales			Net Sales			Sales
Customer A		$	11,489,000			27.8	%	$	11,859,000			27.7	%
Customer B		$	6,457,000			15.6	%	$	7,870,000			18.4	%