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Note 7 - Net Income (Loss) Per Share - Earnings Per Share Reconciliation (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Numerator:        
Numerator for basic and diluted income (loss) per share, net income (loss) available to common shareholders $ 218,483 $ (1,288,169) $ (501,769) $ (2,123,178)
Denominator:        
Denominator for basic income (loss) per share, weighted average shares outstanding (in shares) 19,993,387 13,173,009 19,962,661 13,150,119
Effect of dilutive securities (in shares) 4,969,002 0 0 0
Denominator for diluted earnings per share, adjust weighted average shares and assumed conversion (in shares) 24,962,389 13,173,009 19,962,661 13,150,119
Basic income (loss) per common share (in dollars per share) $ 0.01 $ (0.10) $ (0.03) $ (0.16)
Diluted income (loss) per common share and common share equivalent (in dollars per share) $ 0.01 $ (0.10) $ (0.03) $ (0.16)