4. Inventories (Tables)

12 Months Ended

Dec. 31, 2012

Schedule of Inventory, Current [Table Text Block]

	2012			2011
Raw materials	$	659,149		$	468,053
Finished goods		334,026			100,566
Offsite demo equipment		96,566			183,256
Less inventory reserve		(163,505	)		(22,000	)
	$	926,236		$	729,875