Inventories (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Current inventories
Raw materials	$ 2,024,667	$ 1,919,250
Work in process	4,698,274	4,991,032
Finished goods	7,993,446	7,350,332
Inventory, Gross	14,716,387	14,260,614
Reserve	(1,107,905)	(1,119,193)
Current inventories, total	13,608,482	13,141,421
Non-current inventories
Finished goods	1,238,225	1,238,225
Non-current inventories, total	1,238,225	1,238,225
Total inventories	$ 14,846,707	$ 14,379,646