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Concentration of Credit Risk (Tables)

3 Months Ended

Mar. 31, 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 March 31, 2017 and 2016 are as follows:

		Three Months Ended							Three Months Ended
		March 31, 2017							March 31, 2016
Customer		Net Sales			% of Net Sales				Net Sales			% of Net Sales
Customer A		$	4,427,000			28.8	%		$	5,165,000			34.0	%
Customer B		$	2,609,000			17.0	%		$	2,340,000			15.4	%