Retirement Benefit Plans (Details Narrative) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019	Mar. 28, 2020
Total contributions for the period	$ 245,142	$ 229,736	$ 1,099,918	$ 1,076,568
Non-Union U.S. Employees [Member]
Total contributions for the period			$ 550,286
Pension Benefits [Member]
Employer contributions	400,000
Contributions expected to be made by Company in next fiscal year					$ 2,690,000
Postretirement Benefits [Member]
Employer contributions	$ 15,000
Contributions expected to be made by Company in next fiscal year					$ 50,000