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Business Acquisition (Tables)
 6 Months Ended
Mar. 31, 2014
Business Combinations [Abstract]  
Pro forma results of operations
The following unaudited pro forma information presents a summary of the results of operations for the Company including GAF as if the acquisition had occurred on October 1, 2012: 
 
Three Months Ended March 31, 2013
 
Six Months Ended March 31, 2013
Net sales
$
29,376

 
$
58,219

Net income
$
1,455

 
$
4,813

Net income per share (basic)
$
0.27

 
$
0.90

Net income per share (diluted)
$
0.27

 
$
0.89