Statements of Stockholders' Equity - 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		186,707		186,707
Exercise of stock options	$ 594	686,927		687,521
Exercise of stock options, shares	593,838
Issuance of shares for vested restricted stock grants	$ 36	(36)
Issuance of shares for vested restricted stock grants, shares	35,681
Net loss			(3,963,576)	(3,963,576)
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		584,865		584,865
Exercise of stock options	$ 73	89,427		89,500
Exercise of stock options, shares	73,008
Exercise of warrants	$ 321	703,833		704,154
Exercise of warrants, shares	320,070
Issuance of shares for vested restricted stock grants	$ 9	(9)
Issuance of shares for vested restricted stock grants, shares	9,807
Net loss			(2,548,711)	(2,548,711)
Balance at Dec. 31, 2019	$ 16,042	$ 128,668,583	$ (116,935,112)	$ 11,749,513
Balance, shares at Dec. 31, 2019	16,041,650