Retirement Benefit Plans (Details 1) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 03, 2021	Jun. 27, 2020	Jul. 03, 2021	Jun. 27, 2020
Total contributions for the period	$ 192,078	$ 184,935	$ 735,751	$ 761,621
Regular Matching Contributions [Member]
Total contributions for the period	144,081	132,016	297,397	294,808
Transitional Credit Contributions [Member]
Total contributions for the period	33,102	40,529	75,870	95,200
Non-Discretionary Contributions [Member]
Total contributions for the period	$ 14,895	$ 12,390	$ 362,484	$ 371,613