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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 369,739 369,739
Net income (loss) (1,212,991) (1,212,991)
Balance at Mar. 31, 2019 $ 15,639 127,660,206 (115,599,392) 12,076,453
Balance, shares at Mar. 31, 2019 15,638,765      
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 86,042 86,042
Exercise of warrants $ 50 109,950 110,000
Exercise of warrants, shares 50,000      
Exercise of stock options, net of cashless exercise of 2,451 shares $ 115 125,172 125,287
Exercise of stock options, net of cashless exercise of 2,451 shares, shares 115,307      
Issuance of shares for vested restricted stock grants $ 3 (3)
Issuance of shares for vested restricted stock grants, shares 2,670      
Net income (loss) 26,602 26,602
Balance at Mar. 31, 2020 $ 16,210 $ 128,989,744 $ (116,908,510) $ 12,097,444
Balance, shares at Mar. 31, 2020 16,209,627