Consolidated Statement of Stockholders' Equity (Unaudited) - 3 months ended Mar. 31, 2018 - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Total
Balance at Dec. 31, 2017	$ 15,009	$ 126,416,869	$ (110,422,825)	$ 16,009,053
Balance, shares at Dec. 31, 2017	15,009,246
Stock-based compensation expense		60,708		60,708
Exercise of stock options	$ 594	686,927		687,521
Exercise of stock options, shares	593,838
Vesting of restricted stock	$ 6	(6)
Vesting of restricted stock, shares	5,859
Net loss			(1,067,957)	(1,067,957)
Balance at Mar. 31, 2018	$ 15,609	$ 127,164,498	$ (111,490,782)	$ 15,689,325
Balance, shares at Mar. 31, 2018	15,608,943