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Statements of Stockholders' Equity (Unaudited) - 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 513,824 513,824
Exercise of stock options, net of cashless exercise of shares $ 58 63,192 63,250
Exercise of stock options, net of cashless exercise of shares, shares 58,008      
Exercise of warrants $ 179 392,675 392,854
Exercise of warrants, shares 178,570      
Issuance of shares for restricted stock grants $ 5 (5)
Issuance of shares for restricted stock grants, shares 5,799      
Net loss (2,654,898) (2,654,898)
Balance at Sep. 30, 2019 $ 15,881 128,260,153 (117,041,299) 11,234,735
Balance, shares at Sep. 30, 2019 15,881,142      
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      
Stock-based compensation expense 71,043 71,043
Exercise of warrants $ 86 188,485 188,571
Exercise of warrants, shares 85,714      
Issuance of shares for restricted stock grants $ 3 (3)
Issuance of shares for restricted stock grants, shares 3,799      
Net loss (568,230) (568,230)
Balance at Sep. 30, 2019 $ 15,881 128,260,153 (117,041,299) 11,234,735
Balance, shares at Sep. 30, 2019 15,881,142      
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 286,909 286,909
Exercise of stock options, net of cashless exercise of shares $ 674 167,934 168,608
Exercise of stock options, net of cashless exercise of shares, shares 674,171      
Exercise of warrants $ 51 111,599 111,650
Exercise of warrants, shares 50,750      
Issuance of shares for restricted stock grants $ 20 (20)
Issuance of shares for restricted stock grants, shares 20,279      
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 84,696 84,711
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 (701,259) (701,259)
Balance at Sep. 30, 2020 $ 18,390 138,411,649 (117,636,371) 20,793,668
Balance, shares at Sep. 30, 2020 18,390,229      
Balance at Jun. 30, 2020 $ 18,028 139,715,197 (117,668,783) 22,064,442
Balance, shares at Jun. 30, 2020 18,028,282      
Stock-based compensation expense 97,157 97,157
Exercise of stock options, net of cashless exercise of shares $ 527 28,823 29,350
Exercise of stock options, net of cashless exercise of shares, shares 527,214      
Exercise of warrants $ 1 1,649 1,650
Exercise of warrants, shares 750      
Issuance of shares for restricted stock grants $ 7 (7)
Issuance of shares for restricted stock grants, shares 7,284      
Settlement of executive bonuses with issuance of restricted stock units $ 6 31,245 31,251
Settlement of executive bonuses with issuance of restricted stock units, shares 5,531      
Shares forfeited in exchange for withholding taxes $ (179) (1,462,415) (1,462,594)
Shares forfeited in exchange for withholding taxes, shares (178,832)      
Net loss 32,412 32,412
Balance at Sep. 30, 2020 $ 18,390 $ 138,411,649 $ (117,636,371) $ 20,793,668
Balance, shares at Sep. 30, 2020 18,390,229