Supplemental Cash Flow Information (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Supplemental Cash Flow Information
Interest	$ 57,669	$ 126,999	$ 127,378
Income taxes, net of refunds	4,960,408	3,793,454	5,522,702
Cashless exercises	140,467	93,879	343,750
Consideration to Packaging Alternatives Corporation in the form of a holdback	600,000
Consideration to Packaging Alternatives Corporation in the form of Long-term note	$ 692,000