Concentration of Credit Risk (Tables)

6 Months Ended

Jun. 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 June 30, 2017 and 2016 are as follows:

	Three Months Ended					Three Months Ended
	June 30, 2017					June 30, 2016
			% of Net					% of Net
Customer	Net Sales		Sales			Net Sales		Sales
Customer A	$	3,867,000		30.2	%	$	3,607,000		25.5	%
Customer B	$	1,565,000		12.2	%	$	2,460,000		17.4	%

	Six Months Ended					Six Months Ended
	June 30, 2017					June 30, 2016
			% of Net					% of Net
Customer	Net Sales		Sales			Net Sales		Sales
Customer A	$	8,294,000		29.4	%	$	8,772,000		29.9	%
Customer B	$	4,174,000		14.8	%	$	4,800,000		16.4	%