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Note 5 - Net Income (Loss) Per Common and Common Equivalent Share - Table of Both Basic and Diluted EPS (Details) - USD ($)
 3 Months Ended
Mar. 29, 2025
Mar. 30, 2024
Net income (loss) $ 95,962 $ (143,153)
Weighted average number of basic common shares outstanding (in shares) 14,525,960 14,519,215
Net income (loss) per basic common share (in dollars per share) $ 0.01 $ (0.01)
Dilutive effect of stock options (in shares) 17,951 0
Weighted average number of diluted common shares outstanding (in shares) 14,543,911 14,519,215
Net income (loss) per diluted common share (in dollars per share) $ 0.01 $ (0.01)