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Summary of Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2013
Accounting Policies [Abstract]  
Schedule of Product Warranty Liability [Table Text Block]
The details of changes in the Company’s warranty accrual are as follows:

 
March 31, 2013
 
December 31, 2012
Balance at the beginning of year
$
385

 
$
467

Warranty accruals/additions
132

 
443

Warranty usage
(132
)
 
(525
)
Balance at end of period
$
385

 
$
385
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Earnings Per Share – The following table sets forth the computation of basic and diluted earnings per common share:

 
Three months ended March 31,
 
2013
 
2012
Numerator:
 
 
 
Net income
$
731

 
$
478

Denominator:
 
 
 
Basic weighted average shares outstanding
9,152,859

 
9,098,152

Dilutive common stock equivalents using treasury stock method
241,322

 
148,158

Diluted weighted average shares outstanding
9,394,181

 
9,246,310

 
 
 
 
Basic earnings per common share
$
0.08

 
$
0.05

Diluted earnings per common share
$
0.08

 
$
0.05

 
 
 
 
Weighted average options outstanding
1,128,483

 
1,163,526

Anti-dilutive options not included in the computations
208,957

 
563,237