Goodwill and Other Intangible Assets (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 4,150,340		$ 4,150,340		$ 4,150,339
Other intangible assets:
Gross carrying amount	3,856,262		3,856,262		3,816,402
Accumulated amortization	(3,745,591)		(3,745,591)		(3,674,771)
Net carrying amount	110,671		110,671		$ 141,631
Amortization of intangible assets	$ 36,541	$ 39,858	$ 70,820	$ 80,773