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Segment Data (Details 2) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting                      
Net sales $ 34,993,000 $ 34,700,000 $ 35,832,000 $ 33,697,000 $ 33,370,000 $ 31,967,000 $ 33,673,000 $ 31,952,000 $ 139,223,000 $ 130,962,000 $ 127,244,000
Operating income                 17,398,000 16,666,000 15,716,000
Total assets 105,020,000       98,617,000       105,020,000 98,617,000 79,721,000
Depreciation / amortization                 4,084,000 2,928,000 2,781,000
Capital expenditures                 5,830,000 11,994,000 3,741,000
Interest expense, net                 205,000 90,000 27,000
Goodwill 7,322,000       7,039,000       7,322,000 7,039,000 6,481,000
Unallocated Assets
                      
Segment Reporting                      
Total assets 37,303,000       33,480,000       37,303,000 33,480,000 29,849,000
Component Products
                      
Segment Reporting                      
Net sales                 93,188,000 88,171,000 84,652,000
Operating income                 11,760,000 13,586,000 13,036,000
Total assets 30,001,000       34,502,000       30,001,000 34,502,000 27,169,000
Depreciation / amortization                 1,783,000 1,348,000 1,544,000
Capital expenditures                 2,798,000 2,511,000 1,029,000
Interest expense, net                 91,000 40,000 15,000
Goodwill 5,304,000       5,021,000       5,304,000 5,021,000 4,463,000
Packaging
                      
Segment Reporting                      
Net sales                 46,035,000 42,791,000 42,592,000
Operating income                 5,638,000 3,080,000 2,680,000
Total assets 37,716,000       30,635,000       37,716,000 30,635,000 22,703,000
Depreciation / amortization                 2,301,000 1,580,000 1,237,000
Capital expenditures                 3,032,000 9,483,000 2,712,000
Interest expense, net                 114,000 50,000 12,000
Goodwill $ 2,018,000       $ 2,018,000       $ 2,018,000 $ 2,018,000 $ 2,018,000