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Concentration of Credit Risk (Tables)
6 Months Ended
Jun. 30, 2014
Risks and Uncertainties [Abstract]  
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
Sales to these customers for the three and six months ended June 30, 2014 and 2013 are as follows:
 
 
 
Three Months Ended
 
 
Three Months Ended
 
 
 
June 30, 2014
 
 
June 30, 2013
 
Customer
 
Net Sales
 
% of Net
Sales
 
Net Sales
 
% of Net 
Sales
 
Customer A
 
$
3,703,000
 
 
 
28.1
%
 
$
3,537,000
 
 
 
27.1
%
 
Customer B
 
$
1,379,000
 
 
 
10.5
%
 
$
1,921,000
 
 
 
14.7
%
 
 
 
 
Six Months Ended
 
Six Months Ended
 
 
 
June 30, 2014
 
June 30, 2013
 
Customer
 
Net Sales
 
% of Net 
Sales
 
Net Sales
 
% of Net 
Sales
 
Customer A
 
$
7,930,000
 
 
 
28.2
%
 
$
8,411,000
 
 
 
31.9
%
 
Customer B
 
$
3,163,000
 
 
 
11.3
%
 
$
2,681,000
 
 
 
10.2
%