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Quarterly Results of Operations (Unaudited) Quarterly Results of Operations (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information [Table Text Block]
Quarterly data for the years ended December 31, 2011 and 2010, consisted of the following (in thousands, except per share amounts):

 
Quarter Ended
 
March 31
 
June 30
 
September 30
 
December 31
 
 
 
 
 
 
 
 
2011
 

 
 

 
 

 
 

 
 
 
 
 
 
 
 
Net sales
$
86,631

 
$
91,249

 
$
90,477

 
$
91,092

Gross profit
39,785

 
42,484

 
41,054

 
42,145

Income from operations
10,210

 
10,847

 
6,507

 
5,626

Income tax expense
3,159

 
3,746

 
2,120

 
806

Net income
6,639

 
6,872

 
4,563

 
4,970

Basic earnings per common share
0.19

 
0.19

 
0.11

 
0.12

Diluted earnings per common share
0.18

 
0.18

 
0.11

 
0.12

 
 
 
 
 
 
 
 
2010
 

 
 

 
 

 
 

 
 
 
 
 
 
 
 
Net sales
$
67,432

 
$
74,948

 
$
73,172

 
$
81,203

Gross profit
28,435

 
32,458

 
31,247

 
36,358

Income (loss) from operations
6,346

 
8,777

 
(3,442
)
 
5,523

Income tax expense (benefit)
1,822

 
3,124

 
(1,539
)
 
921

Net income (loss)
4,508

 
5,715

 
(1,973
)
 
4,210

Basic earnings (loss) per common share
0.13

 
0.16

 
(0.06
)
 
0.12

Diluted earnings (loss) per common share
0.13

 
0.16

 
(0.06
)
 
0.12