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Statements of Stockholders' Equity (Unaudited) - USD ($)
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Total
Beginning balance, value at Dec. 31, 2019 $ 16,042 $ 128,668,583 $ (116,935,112) $ 11,749,513
Beginning balance, shares at Dec. 31, 2019 16,041,650      
Stock-based compensation expense 189,752 189,752
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      
Exercise of stock options, net of cashless exercise of shares $ 147 139,111 139,258
Exercise of stock options, net of cashless exercise of shares, shares 146,957      
Exercise of warrants $ 50 109,950 110,000
Exercise of warrants, shares 50,000      
Issuance of shares for restricted stock grants $ 13 (13)
Issuance of shares for restricted stock grants, shares 12,995      
Settlement of executive bonuses with issuance of restricted stock units $ 9 53,451 53,460
Settlement of executive bonuses with issuance of restricted stock units, shares 9,462      
Shares forfeited in exchange for withholding taxes $ (2) (13,335) (13,337)
Shares forfeited in exchange for withholding taxes, shares (2,012)      
Net loss (733,671) (733,671)
Ending balance, value at Jun. 30, 2020 $ 18,028 139,715,197 (117,668,783) 22,064,442
Ending balance, shares at Jun. 30, 2020 18,028,282      
Beginning balance, value at Mar. 31, 2020 $ 16,210 128,989,744 (116,908,510) 12,097,444
Beginning balance, shares at Mar. 31, 2020 16,209,627      
Stock-based compensation expense 103,710 103,710
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      
Exercise of stock options, net of cashless exercise of shares $ 32 13,939 13,971
Exercise of stock options, net of cashless exercise of shares, shares 31,650      
Issuance of shares for restricted stock grants $ 10 (10)
Issuance of shares for restricted stock grants, shares 10,325      
Settlement of executive bonuses with issuance of restricted stock units $ 9 53,451 53,460
Settlement of executive bonuses with issuance of restricted stock units, shares 9,462      
Shares forfeited in exchange for withholding taxes $ (2) (13,335) (13,337)
Shares forfeited in exchange for withholding taxes, shares (2,012)      
Net loss (760,273) (760,273)
Ending balance, value at Jun. 30, 2020 $ 18,028 139,715,197 (117,668,783) 22,064,442
Ending balance, shares at Jun. 30, 2020 18,028,282      
Beginning balance, value at Dec. 31, 2020 $ 18,410 138,569,746 (116,376,715) 22,211,441
Beginning balance, shares at Dec. 31, 2020 18,410,458      
Stock-based compensation expense 1,631,616 1,631,616
Exercise of stock options, net of cashless exercise of shares $ 299 46,171 46,470
Exercise of stock options, net of cashless exercise of shares, shares 299,179      
Exercise of warrants $ 9 19,791 19,800
Exercise of warrants, shares 9,000      
Issuance of shares for restricted stock grants $ 10 (10)
Issuance of shares for restricted stock grants, shares 8,915      
Net loss (1,797,851) (1,797,851)
Ending balance, value at Jun. 30, 2021 $ 18,728 140,267,314 (118,174,566) 22,111,476
Ending balance, shares at Jun. 30, 2021 18,727,552      
Beginning balance, value at Mar. 31, 2021 $ 18,686 139,550,103 (117,436,781) 22,132,008
Beginning balance, shares at Mar. 31, 2021 18,686,391      
Stock-based compensation expense 650,983 650,983
Exercise of stock options, net of cashless exercise of shares $ 25 46,445 46,470
Exercise of stock options, net of cashless exercise of shares, shares 25,000      
Exercise of warrants $ 9 19,791 19,800
Exercise of warrants, shares 9,000      
Issuance of shares for restricted stock grants $ 8 (8)
Issuance of shares for restricted stock grants, shares 7,161      
Net loss (737,785) (737,785)
Ending balance, value at Jun. 30, 2021 $ 18,728 $ 140,267,314 $ (118,174,566) $ 22,111,476
Ending balance, shares at Jun. 30, 2021 18,727,552