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Note 7 - Net Income (Loss) Per Share - Earnings Per Share Reconciliation (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Numerator:        
Numerator for basic and diluted income (loss) per share, net income (loss) available to common shareholders $ 141,234 $ (936,017) $ (360,535) $ (3,059,195)
Denominator:        
Denominator for basic (loss) per share, weighted average shares outstanding (in shares) 20,033,515 15,474,171 19,986,279 13,924,803
Effect of dilutive securities (in shares) 4,902,002 0 0 0
Denominator for diluted earnings per share, adjust weighted average shares and assumed conversion (in shares) 24,935,517 15,474,171 19,986,279 13,924,803
Basic income (loss) per common share (in dollars per share) $ 0.01 $ (0.06) $ (0.02) $ (0.22)
Diluted income (loss) per common share and common share equivalent (in dollars per share) $ 0.01 $ (0.06) $ (0.02) $ (0.22)