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Selected Quarterly Financial Data (unaudited) (Tables)
 12 Months Ended
Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]  
Selected Quarterly Financial Data
Selected quarterly financial data for years ended December 31, 2014 and 2013 follows (in thousands, except per share data):
 
 
Quarter Ended
 
March 31,
 
June 30,
 
September 30,
 
December 31,
 
2014
 
2014
 
2014
 
2014
Net sales
$
36,185

 
$
37,175

 
$
44,349

 
$
46,816

Gross margin
22,208

 
23,214

 
28,713

 
27,413

Net income
3,391

 
3,883

 
7,558

 
5,086

Earnings per share (1):
 
 
 
 
 
 
 
Basic
$
0.06

 
$
0.07

 
$
0.14

 
$
0.10

Diluted
$
0.06

 
$
0.07

 
$
0.14

 
$
0.09

 
 
 
 
 
 
 
 
 
Quarter Ended
 
March 31,
 
June 30,
 
September 30,
 
December 31,
 
2013
 
2013
 
2013
 
2013
Net sales
$
30,434

 
$
32,175

 
$
35,197

 
$
40,025

Gross margin
18,451

 
19,742

 
22,096

 
25,554

Net income
3,298

 
4,457

 
5,114

 
5,375

Earnings per share (1):
 
 
 
 
 
 
 
Basic
$
0.06

 
$
0.09

 
$
0.10

 
$
0.10

Diluted
$
0.06

 
$
0.08

 
$
0.10

 
$
0.10