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Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
Common Stock [Member]
Treasury Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Total
Balance at Dec. 31, 2019 $ 39,613 $ (18,929,915) $ 96,105,851 $ (41,351,078) $ 35,864,471
Stock-based compensation $ 0 0 426,939 0 426,939
Exercise of stock options (in shares) 100,000        
Net loss $ 0 0 0 (2,214,139) (2,214,139)
Balance at Mar. 31, 2020 $ 39,713 $ (18,929,915) 96,707,690 (43,565,217) 34,252,271
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
Stock-based compensation $ 0 $ 0 421,071 0 $ 421,071
Exercise of stock options (in shares) 60,000 0     60,000 [1]
Exercise of stock options $ 60 $ 0 115,740 0 $ 115,800
Net loss $ 0 $ 0 0 (3,294,949) (3,294,949)
Balance (in shares) at Mar. 31, 2021 39,807,659 (12,253,502)      
Balance at Mar. 31, 2021 $ 39,808 $ (18,929,915) $ 98,549,890 $ (53,971,300) $ 25,688,483
[1] Represents the following stock options exercised: A total of 60,000 stock options exercised with a weighted average exercise price of $1.93.