3. Inventories (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Inventories Details
Raw materials	$ 554,732	$ 720,113
Work in process	87,144	0
Finished goods (including $362,500 and $489,400 held by customers at March 31, 2013 and December 31, 2012, respectively)	2,029,506	1,910,273
Total inventories	$ 2,671,382	$ 2,630,386