Statements of Stockholders' Equity - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Total
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, net of cashless exercise of shares	$ 73	89,427		89,500
Exercise of stock options, net of cashless exercise of shares, 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
Stock-based compensation expense		409,477		409,477
Exercise of stock options, net of cashless exercise of shares	$ 690	203,468		204,158
Exercise of stock options, net of cashless exercise of shares, shares	689,901
Exercise of warrants	$ 51	111,599		111,650
Exercise of warrants, shares	50,750
Issuance of shares for vested restricted stock grants	$ 24	(24)
Issuance of shares for vested restricted stock grants, shares	24,778
Issuance of common stock, net of costs	$ 1,769	10,567,698		10,569,467
Issuance of common stock, net of costs, shares	1,769,230
Settlement of executive bonuses with issuance of restricted stock units	$ 15	84,695		84,710
Settlement of executive bonuses with issuance of restricted stock units, shares	14,993
Shares forfeited in exchange for withholding taxes	$ (181)	(1,475,750)		(1,475,931)
Shares forfeited in exchange for withholding taxes, shares	(180,844)
Net loss			558,397	558,397
Balance at Dec. 31, 2020	$ 18,410	$ 138,569,746	$ (116,376,715)	$ 22,211,441
Balance, shares at Dec. 31, 2020	18,410,458