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. 25, 2021	Sep. 26, 2020	Sep. 26, 2020	Sep. 25, 2021	Sep. 26, 2020
Basic EPS Computation:
Net income	$ 2,727,967	$ 231,016	$ 231,016	$ 2,998,067	$ 1,131,901
Weighted average Common shares Outstanding (in shares)	14,324,136		13,288,652	13,963,563	13,234,508
Basic EPS (in dollars per share)	$ 0.19		$ 0.02	$ 0.21	$ 0.09
Diluted EPS Computation:
Net income	$ 2,727,967	$ 231,016	$ 231,016	$ 2,998,067	$ 1,131,901
Weighted average Common shares Outstanding (in shares)	14,324,136		13,288,652	13,963,563	13,234,508
Dilutive effect of stock options (in shares)	487,124		167,834	578,793	87,217
Total Shares (in shares)	14,811,259		13,456,486	14,542,356	13,320,915
Diluted EPS (in dollars per share)	$ 0.18		$ 0.02	$ 0.21	$ 0.09