Retirement Benefit Plans (Details 1) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Defined Contribution Plan [Abstract]
Total contributions for the period	$ 245,142	$ 229,736	$ 1,099,918	$ 1,076,568
Non-Discretionary Contribution [Member]
Defined Contribution Plan [Abstract]
Total contributions for the period	12,390	18,088	580,048	605,129
Regular matching contribution [Member]
Defined Contribution Plan [Abstract]
Total contributions for the period	168,529	136,796	373,521	293,063
Transitional Credit Contribution [Member]
Defined Contribution Plan [Abstract]
Total contributions for the period	$ 64,223	$ 74,852	$ 146,349	$ 178,376