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Unaudited: Quarterly Results of Operations, Common Stock Price and Dividends (Tables)
 12 Months Ended
Dec. 31, 2012
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)
2012
 
 
 
 
 
 
 
Net sales
$
76,233

 
$
81,974

 
$
87,130

 
$
74,323

Gross margin
$
28,864

 
$
30,201

 
$
34,330

 
$
28,851

Net earnings
$
6,249

 
$
7,442

 
$
8,857

 
$
5,484

Earnings per share:
 
 
 
 
 
 
 
Basic
$
0.42

 
$
0.52

 
$
0.63

 
$
0.39

Diluted
$
0.42

 
$
0.52

 
$
0.62

 
$
0.39

Dividends declared
$
0.16

 
$
0.16

 
$
0.17

 
$
0.17

Stock price:
 
 
 
 
 
 
 
High
$
35.05

 
$
39.73

 
$
39.85

 
$
48.60

Low
$
29.30

 
$
32.61

 
$
32.29

 
$
36.25

Quarter-end close
$
33.99

 
$
37.55

 
$
36.39

 
$
47.41

2011
 
 
 
 
 
 
 
Net sales
$
57,359

 
$
75,148

 
$
69,698

 
$
60,710

Gross margin
$
20,437

 
$
27,220

 
$
22,780

 
$
19,383

Net earnings
$
3,260

 
$
7,834

 
$
6,880

 
$
1,187

Earnings per share:
 
 
 
 
 
 
 
Basic
$
0.22

 
$
0.52

 
$
0.46

 
$
0.08

Diluted
$
0.22

 
$
0.52

 
$
0.46

 
$
0.08

Dividends declared
$
0.14

 
$
0.14

 
$
0.16

 
$
0.16

Stock price:
 
 
 
 
 
 
 
High
$
45.47

 
$
41.61

 
$
40.83

 
$
35.41

Low
$
36.44

 
$
33.98

 
$
28.66

 
$
26.86

Quarter-end close
$
41.21

 
$
36.99

 
$
28.93

 
$
29.43