Property and Equipment (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 111,100	$ 117,800	$ 230,993	$ 243,186
Capital Leased Assets, Gross	63,500		63,500		$ 372,600
Accumulated depreciation	3,211,317		3,211,317		2,982,062
Capital lease assets, net	32,200		32,200		21,200
Proceeds from Sale of Property, Plant, and Equipment	309,100		309,100
Leased Equipment [Member]
Property, Plant and Equipment [Line Items]
Accumulated depreciation	31,300		31,300		$ 351,400
Capital Lease Obligations [Member]
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 7,500	$ 19,700	$ 7,500	$ 19,700