(3) Net Income (Loss) Per Common and Common Equivalent Share - Calculation of both basic and diluted EPS (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Basic EPS Computation:
Net income (loss)	$ 299,231	$ 250,598	$ 900,885	$ (493,615)
Weighted average Common shares Outstanding	13,207,436	13,206,069	13,207,436	13,206,756
Basic EPS	$ .02	$ 0.02	$ 0.07	$ (0.04)
Diluted EPS Computation:
Net income (loss)	$ 299,231	$ 250,598	$ 900,885	$ (493,615)
Weighted average Common shares Outstanding	13,207,436	13,206,069	13,207,436	13,206,756
Dilutive effect of stock options	$ 52,347	$ 54,192	$ 46,021
Total Shares	13,259,783	13,260,261	13,253,457	13,206,756
Diluted EPS	$ 0.03	$ 0.02	$ 0.07	$ (0.04)