Geographic information (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2013

Dec. 31, 2012

Schedule Of Geographic Information On Revenues [Table Text Block]

Product sales consist of the following:

	March 31,		March 31,
	2013		2012
Revenue from U.S. product sales	$	1,842,800	$	1,493,400
Revenue from non-U.S. product sales	$	410,300	$	193,000
Total revenue from product sales	$	2,253,100	$	1,686,400

Product sales consist of the following:

	December 31,		December 31,		December 31,
	2012		2011		2010
Revenue from U.S. product sales	$	6,179,000	$	5,583,300	$	3,505,800
Revenue from non-U.S. product sales	$	1,062,400	$	318,800	$	282,100
Total revenue from product sales	$	7,241,400	$	5,902,100	$	3,787,900