Inventories (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Inventories
Raw materials	$ 2,100,641	$ 1,952,398
Work-in-progress	518,352	389,501
Finished goods	1,362,237	1,461,264
Reduction to LIFO cost	(1,292,101)	(1,248,221)
Total inventories	$ 2,689,129	$ 2,554,942