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Note 6 - Net Income (Loss) Per Share - Earnings Per Share Reconciliation (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Numerator for basic and diluted income (loss) per share, net income (loss) available to common shareholders $ (415,086) $ 2,851,267 $ (1,016,710) $ 2,676,572
Denominator:        
Denominator for basic income (loss) per share, weighted average shares outstanding (in shares) 26,892,925 27,322,497 26,719,488 26,747,277
Effect of dilutive securities (in shares) 0 0 0 0
Denominator for diluted earnings per share, adjusted for weighted average shares and assumed conversion (in shares) 26,892,925 27,322,497 26,719,488 26,747,277
Basic income (loss) per common share (in dollars per share) $ (0.02) $ 0.1 $ (0.04) $ 0.1
Diluted income (loss) per common share and common share equivalent (in dollars per share) $ (0.02) $ 0.1 $ (0.04) $ 0.1