Inventories (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Inventories
Raw materials	$ 2,354,016	$ 2,072,540
Work-in-progress	382,728	373,512
Finished goods	1,478,478	1,478,444
Reduction to LIFO cost	(1,250,032)	(1,245,632)
Total Inventory	$ 2,965,190	$ 2,678,864