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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, 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 168,160 168,160
Exercise of stock options $ 594 686,927 687,521
Exercise of stock options, shares 593,838      
Issuance of shares for restricted stock grants $ 29 (29)
Issuance of shares for restricted stock grants, shares 29,112      
Net loss (3,299,551) (3,299,551)
Balance at Sep. 30, 2018 $ 15,632 127,271,927 (113,722,376) 13,565,183
Balance, shares at Sep. 30, 2018 15,632,196      
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      
Stock-based compensation expense 43,459 43,459
Issuance of shares for restricted stock grants $ 7 (7)
Issuance of shares for restricted stock grants, shares 6,957      
Net loss (1,131,219) (1,131,219)
Balance at Sep. 30, 2018 $ 15,632 127,271,927 (113,722,376) 13,565,183
Balance, shares at Sep. 30, 2018 15,632,196      
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 $ 58 63,192 63,250
Exercise of stock options, 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