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Consolidated Statements of Stockholders' Equity - USD ($)
Common Stock [Member]
Treasury Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Total
Balance (in shares) at Dec. 31, 2018 38,966,988 (12,253,502)      
Balance at Dec. 31, 2018 $ 38,967 $ (18,929,915) $ 94,385,230 $ (33,043,113) $ 42,451,169
Stock-based compensation $ 0 $ 0 1,171,079 0 $ 1,171,079
Exercise of stock options (in shares) 645,671 0     781,500
Exercise of stock options $ 646 $ 0 549,542 0 $ 550,188
Net loss $ 0 $ 0 0 (8,307,965) (8,307,965)
Balance (in shares) at Dec. 31, 2019 39,612,659 (12,253,502)      
Balance at Dec. 31, 2019 $ 39,613 $ (18,929,915) 96,105,851 (41,351,078) 35,864,471
Stock-based compensation $ 0 $ 0 1,651,893 0 $ 1,651,893
Exercise of stock options (in shares) 135,000 0     135,000 [1]
Exercise of stock options $ 135 $ 0 255,335 0 $ 255,470
Net loss $ 0 $ 0 0 (9,325,273) (9,325,273)
Balance (in shares) at Dec. 31, 2020 39,747,659 (12,253,502)      
Balance at Dec. 31, 2020 $ 39,748 $ (18,929,915) $ 98,013,079 $ (50,676,351) $ 28,446,561
[1] Represents the following stock options exercised: A total of 135,000 stock options exercised with a weighted average market price of $1.89.