Statement of Stockholders' Equity (Unaudited) - 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		124,701		124,701
Exercise of stock options	$ 594	686,927		687,521
Exercise of stock options, shares	593,838
Issuance of shares for restricted stock grants	$ 22	(22)
Issuance of shares for restricted stock grants, shares	22,155
Net loss			(2,168,332)	(2,168,332)
Balance at Jun. 30, 2018	$ 15,625	127,228,475	(112,591,157)	14,652,943
Balance, shares at Jun. 30, 2018	15,625,239
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
Stock-based compensation expense		63,993		63,993
Exercise of stock options
Exercise of stock options, shares
Issuance of shares for restricted stock grants	$ 16	(16)
Issuance of shares for restricted stock grants, shares	16,296
Net loss			(1,100,375)	(1,100,375)
Balance at Jun. 30, 2018	$ 15,625	127,228,475	(112,591,157)	14,652,943
Balance, shares at Jun. 30, 2018	15,625,239
Balance at Dec. 31, 2018	$ 15,639	127,290,467	(114,386,401)	12,919,705
Balance, shares at Dec. 31, 2018	15,638,765
Stock-based compensation expense		442,781		442,781
Exercise of stock options	$ 58	63,192		63,250
Exercise of stock options, shares	58,008
Exercise of warrants	$ 93	204,190		204,283
Exercise of warrants, shares	92,856
Issuance of shares for restricted stock grants	$ 2	(2)
Issuance of shares for restricted stock grants, shares	2,000
Net loss			(2,086,668)	(2,086,668)
Balance at Jun. 30, 2019	$ 15,792	128,000,628	(116,473,069)	11,543,351
Balance, shares at Jun. 30, 2019	15,791,629
Balance at Mar. 31, 2019	$ 15,639	127,660,206	(115,599,392)	12,076,453
Balance, shares at Mar. 31, 2019	15,638,765
Stock-based compensation expense		73,042		73,042
Exercise of stock options	$ 58	63,192		63,250
Exercise of stock options, shares	58,008
Exercise of warrants	$ 93	204,190		204,283
Exercise of warrants, shares	92,856
Issuance of shares for restricted stock grants	$ 2	(2)
Issuance of shares for restricted stock grants, shares	2,000
Net loss			(873,677)	(873,677)
Balance at Jun. 30, 2019	$ 15,792	$ 128,000,628	$ (116,473,069)	$ 11,543,351
Balance, shares at Jun. 30, 2019	15,791,629