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
	Jun. 26, 2021	Jun. 27, 2020	Jun. 26, 2021	Jun. 27, 2020
Basic EPS Computation:
Net income	$ 239,198	$ 299,231	$ 270,101	$ 900,885
Weighted average Common shares Outstanding (in shares)	13,982,177	13,207,436	13,783,276	13,207,436
Basic EPS (in dollars per share)	$ 0.02	$ 0.02	$ 0.02	$ 0.07
Diluted EPS Computation:
Net income	$ 239,198	$ 299,231	$ 270,101	$ 900,885
Weighted average Common shares Outstanding (in shares)	13,982,177	13,207,436	13,783,276	13,207,436
Dilutive effect of stock options (in shares)	568,741	52,347	624,628	46,021
Total Shares (in shares)	14,550,918	13,259,783	14,407,904	13,253,457
Diluted EPS (in dollars per share)	$ 0.02	$ 0.02	$ 0.02	$ 0.07