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Selected Quarterly Financial Data (unaudited) (Tables)
 12 Months Ended
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]  
Selected Quarterly Financial Data
Selected quarterly financial data for years ended December 31, 2015 and 2014 follows (in thousands, except per share data):
 
 
Quarter Ended
 
March 31,
 
June 30,
 
September 30,
 
December 31,
 
2015
 
2015
 
2015
 
2015
Net sales
$
44,762

 
$
46,713

 
$
50,376

 
$
56,041

Gross margin
29,868

 
30,723

 
31,068

 
36,988

Net income
7,205

 
6,103

 
1,521

 
5,104

Earnings per share (1):
 
 
 
 
 
 
 
Basic
$
0.14

 
$
0.11

 
$
0.03

 
$
0.10

Diluted
$
0.13

 
$
0.11

 
$
0.03

 
$
0.09

 
 
 
 
 
 
 
 
 
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



(1) Basic and diluted earnings per share are computed independently for each of the quarters presented. Therefore, the sum of quarterly basic and diluted per share information may not equal annual basic and diluted earnings per share.