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Note 6 - Net Income (Loss) Per Share - Earnings Per Share Reconciliation (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Numerator for basic and diluted income (loss) per share, net (loss) available to common shareholders $ (366,654) $ 75,492 $ (601,624) $ (174,696)
Denominator:        
Denominator for basic income (loss) per share, weighted average shares outstanding (in shares) 26,456,411 26,534,407 26,577,052 26,454,848
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) 26,456,411 26,534,407 26,577,052 26,454,848
Basic income (loss) per common share (in dollars per share) $ (0.01) $ 0 $ (0.02) $ (0.01)
Diluted income (loss) per common share and common share equivalent (in dollars per share) $ (0.01) $ 0 $ (0.02) $ (0.01)