Segment Reporting (Details 2) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Segment Reporting
Net sales	$ 33,672,605	$ 33,500,994	$ 65,624,828	$ 65,004,582
Operating income	4,305,698	4,316,712	7,993,998	8,226,508
Total assets	83,863,255	74,756,859	83,863,255	74,756,859	79,721,254
Depreciation / amortization	716,637	711,054	1,404,839	1,403,492
Capital expenditures	2,719,992	751,552	5,029,274	1,004,256
Engineered Packaging
Segment Reporting
Net sales	10,605,606	10,807,574	20,223,428	20,684,265
Operating income	553,073	492,527	1,007,729	1,408,601
Total assets	24,668,621	19,591,327	24,668,621	19,591,327
Depreciation / amortization	386,847	347,576	722,245	681,227
Capital expenditures	1,496,955	539,732	3,332,525	710,671
Component Products
Segment Reporting
Net sales	23,066,999	22,693,420	45,401,400	44,320,317
Operating income	3,752,625	3,824,185	6,986,269	6,817,907
Total assets	29,957,940	28,886,863	29,957,940	28,886,863
Depreciation / amortization	329,790	363,478	682,594	722,265
Capital expenditures	1,223,037	211,820	1,696,749	293,585
Unallocated Assets
Segment Reporting
Total assets	$ 29,236,694	$ 26,278,669	$ 29,236,694	$ 26,278,669