(3) Net Income (loss) Per Common and Common Equivalent Share - Calculation of both basic and diluted EPS (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Basic EPS Computation:
Net income (loss)	$ 231,016	$ (495,970)	$ 1,131,901	$ (989,586)
Weighted average Common shares Outstanding	13,288,652	13,206,069	13,234,508	13,206,984
Basic EPS	$ 0.02	$ (0.04)	$ 0.09	$ (0.07)
Diluted EPS Computation:
Net income (loss)	$ 231,016	$ (495,970)	$ 1,131,901	$ (989,586)
Weighted average Common shares Outstanding	13,288,652	13,206,069	13,234,508	13,206,984
Dilutive effect of stock options	$ 167,834		$ 87,217
Total Shares	13,456,486	13,206,069	13,320,915	13,206,984
Diluted EPS	$ 0.02	$ (0.04)	$ 0.09	$ (0.07)