Property, Plant and Equipment (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Property, plant and equipment
Property, plant, and equipment, gross	$ 32,221,978	$ 31,004,295
Less accumulated depreciation	(26,632,409)	(25,726,628)
Property, plant, and equipment, net	5,589,569	5,277,667
Land
Property, plant and equipment
Property, plant, and equipment, gross	90,000	90,000
Buildings
Property, plant and equipment
Property, plant, and equipment, gross	15,332,232	15,332,232
Building improvements
Property, plant and equipment
Property, plant, and equipment, gross	5,002,536	4,923,827
Software, machinery and equipment
Property, plant and equipment
Property, plant, and equipment, gross	$ 11,797,210	$ 10,658,236