Note 3 - Net Income Per Common and Common Equivalent Share - Basic and Diluted Earnings Per Share (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 01, 2023	Jul. 02, 2022	Jul. 02, 2023	Jul. 01, 2023	Jul. 02, 2022
Basic EPS Computation:
Net income (loss)	$ 600,503	$ 455,108	$ 874,544	$ 1,059,704	$ 874,544
Weighted average common shares outstanding (in shares)	14,493,970	14,431,825		14,473,128	14,410,064
Basic EPS (in dollars per share)	$ 0.04	$ 0.03		$ 0.07	$ 0.06
Diluted EPS Computation:
Net income (loss)	$ 600,503	$ 455,108	$ 874,544	$ 1,059,704	$ 874,544
Weighted average common shares outstanding (in shares)	14,493,970	14,431,825		14,473,128	14,410,064
Dilutive effect of stock options (in shares)	127,959	276,821		157,637	272,452
Total Shares (in shares)	14,621,929	14,708,646		14,630,765	14,682,516
Diluted EPS (in dollars per share)	$ 0.04	$ 0.03		$ 0.07	$ 0.06