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Unaudited: Quarterly Results of Operations, Common Stock Price and Dividends (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information
 
Quarter ended
 
March 31
 
June 30
 
September 30
 
December 31
 
(In thousands except per share data)
2017
 
 
 
 
 
 
 
Net sales
$
101,606

 
$
104,176

 
$
100,008

 
$
96,650

Gross margin
$
38,650

 
$
41,054

 
$
37,039

 
$
39,003

Net earnings
$
8,749

 
$
10,614

 
$
7,975

 
$
7,233

Earnings per share:
 
 
 
 
 
 
 
Basic
$
0.30

 
$
0.37

 
$
0.28

 
$
0.25

Diluted
$
0.30

 
$
0.36

 
$
0.27

 
$
0.25

Dividends declared
$
0.115

 
$
0.115

 
$
0.130

 
$
0.130

Stock price:
 
 
 
 
 
 
 
High
$
39.85

 
$
41.58

 
$
49.45

 
$
52.10

Low
$
34.40

 
$
35.15

 
$
39.10

 
$
42.00

Quarter-end close
$
36.75

 
$
39.85

 
$
49.00

 
$
47.80

 
 
 
 
 
 
 
 
2016
 
 
 
 
 
 
 
Net sales
$
100,570

 
$
103,820

 
$
96,273

 
$
93,098

Gross margin
$
39,011

 
$
39,396

 
$
38,647

 
$
33,522

Net earnings
$
7,990

 
$
9,400

 
$
8,792

 
$
6,113

Earnings per share:
 
 
 
 
 
 
 
Basic
$
0.28

 
$
0.33

 
$
0.30

 
$
0.21

Diluted
$
0.28

 
$
0.32

 
$
0.30

 
$
0.21

Dividends declared
$
0.100

 
$
0.100

 
$
0.115

 
$
0.115

Stock price:
 
 
 
 
 
 
 
High
$
34.74

 
$
39.36

 
$
37.80

 
$
39.15

Low
$
26.40

 
$
31.72

 
$
31.90

 
$
29.30

Quarter-end close
$
33.26

 
$
36.52

 
$
33.51

 
$
36.95