Note 3 - Net Income Per Common and Common Equivalent Share - Table of Both Basic and Diluted EPS (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 02, 2022	Jun. 26, 2021	Jul. 02, 2022	Jun. 26, 2021
Basic EPS Computation:
Net income (loss)	$ 455,108	$ 239,198	$ 874,544	$ 270,101
Weighted average common shares outstanding (in shares)	14,431,825	13,982,177	14,410,064	13,783,276
Basic EPS (in dollars per share)	$ 0.03	$ 0.02	$ 0.06	$ 0.02
Diluted EPS Computation:
Net income (loss)	$ 455,108	$ 239,198	$ 874,544	$ 270,101
Weighted average common shares outstanding (in shares)	14,431,825	13,982,177	14,410,064	13,783,276
Dilutive effect of stock options (in shares)	276,821	568,741	272,452	624,628
Total Shares (in shares)	14,708,646	14,550,918	14,682,516	14,407,904
Diluted EPS (in dollars per share)	$ 0.03	$ 0.02	$ 0.06	$ 0.02