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Segment Reporting (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
item
Mar. 31, 2013
Segment Reporting    
Number of distinct segments 2  
Segment Reporting    
Net sales $ 34,609 $ 33,697
Operating income 3,195 2,956
Depreciation / amortization 1,131 974
Capital expenditures 1,377 1,252
Component Products
   
Segment Reporting    
Net sales 23,611 23,417
Operating income 2,443 2,815
Depreciation / amortization 498 445
Capital expenditures 372 756
Packaging
   
Segment Reporting    
Net sales 10,998 10,820
Operating income 752 141
Depreciation / amortization 633 529
Capital expenditures $ 1,005 $ 496