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Selected Quarterly Financial Data (unaudited)
 12 Months Ended
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]  
Selected Quarterly Financial Data (unaudited)
Selected Quarterly Financial Data (unaudited)
Selected quarterly financial data for years ended December 31, 2016 and 2015 follows (in thousands, except per share data):
 
Quarter Ended
 
March 31,
 
June 30,
 
September 30,
 
December 31,
 
2016
 
2016
 
2016
 
2016
Net sales
$
55,530

 
$
58,756

 
$
71,882

 
$
82,077

Gross margin
36,902

 
37,299

 
46,565

 
49,770

Net income
3,463

 
3,650

 
3,843

 
6,341

Earnings per share (1):
 
 
 
 
 
 
 
Basic
$
0.06

 
$
0.07

 
$
0.07

 
$
0.12

Diluted
$
0.06

 
$
0.07

 
$
0.07

 
$
0.12

 
 
 
 
 
 
 
 
 
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


(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.