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Quarterly financial summary (unaudited) (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Quarterly financial summary
Unaudited quarterly results for the last two years were as follows (in thousands, except per share data):
 
Q1
 
Q2
 
Q3
 
Q4 (1)
2018
 
 
 
 
 
 
 
Net sales
$
65,920

 
$
59,055

 
$
63,889

 
$
78,571

Gross profit
$
40,208

 
$
36,645

 
$
38,969

 
$
46,919

Net income
$
690

 
$
1,248

 
$
3,915

 
$
9,672

Net income per share:
 
 
 
 
 
 
 
Basic
$
0.01

 
$
0.03

 
$
0.08

 
$
0.20

Diluted
$
0.01

 
$
0.03

 
$
0.08

 
$
0.20

2017
 
 
 
 
 
 
 
Net sales
$
60,574

 
$
55,856

 
$
71,865

 
$
81,593

Gross profit
$
38,228

 
$
35,890

 
$
42,913

 
$
47,694

Net income
$
2,160

 
$
3,970

 
$
5,865

 
$
21,480

Net income per share:
 
 
 
 
 
 
 
Basic
$
0.05

 
$
0.09

 
$
0.13

 
$
0.47

Diluted
$
0.04

 
$
0.08

 
$
0.12

 
$
0.44


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(1) Results for the fourth quarter of fiscal 2017 included a tax benefit from the adoption of the 2017 Tax Act, which had a favorable impact of $0.25 and $0.23 on basic and diluted earnings per share, respectively.