Note 3 - Net Income (Loss) Per Common and Common Equivalent Share - Table of Both Basic and Diluted EPS (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Oct. 01, 2022	Sep. 30, 2023	Oct. 01, 2022
Basic EPS Computation:
Net income	$ 171,081	$ 987,865	$ 1,230,785	$ 1,862,409
Weighted average number of basic common shares outstanding (in shares)	14,517,364	14,434,468	14,487,873	14,417,995
Basic EPS (in dollars per share)	$ 0.01	$ 0.07	$ 0.08	$ 0.13
Diluted EPS Computation:
Net income	$ 171,081	$ 987,865	$ 1,230,785	$ 1,862,409
Weighted average number of basic common shares outstanding (in shares)	14,517,364	14,434,468	14,487,873	14,417,995
Dilutive effect of stock options (in shares)	118,877	252,008	144,718	265,637
Total Shares (in shares)	14,636,241	14,686,476	14,632,591	14,683,632
Diluted EPS (in dollars per share)	$ 0.01	$ 0.07	$ 0.08	$ 0.13