Note 3 - Net Income Per Common and Common Equivalent Share - Basic and Diluted Earnings Per Share (Details) - USD ($)	3 Months Ended
	Apr. 01, 2023	Apr. 02, 2022
Basic EPS Computation:
Net income	$ 459,201	$ 419,436
Weighted average common shares outstanding (in shares)	14,452,284	14,389,857
Basic EPS (in dollars per share)	$ 0.03	$ 0.03
Diluted EPS Computation:
Net income	$ 459,201	$ 419,436
Weighted average common shares outstanding (in shares)	14,452,284	14,389,857
Dilutive effect of stock options (in shares)	187,316	268,082
Total Shares (in shares)	14,639,600	14,657,939
Diluted EPS (in dollars per share)	$ 0.03	$ 0.03