Property and Equipment (Tables)
12 Months Ended
Dec. 31, 2013
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment [Table Text Block]
The major classes of property and equipment  consist of the following at December 31:
 
 
 
2013
 
2012
 
Furniture and fixtures
 
$
21,036
 
$
21,298
 
Computers and office equipment
 
 
58,741
 
 
89,492
 
Lab equipment
 
 
497,328
 
 
543,251
 
 
 
 
577,105
 
 
654,041
 
Less accumulated depreciation
 
 
(346,134)
 
 
(423,644)
 
Property and equipment, net
 
$
230,971
 
$
230,397