Retirement Benefit Plans (Details Narrative) - USD ($)	3 Months Ended		9 Months Ended
	Oct. 03, 2020	Sep. 28, 2019	Oct. 03, 2020	Sep. 28, 2019
Total contributions for the period	$ 254,122	$ 205,120	$ 1,354,040	$ 1,281,688
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		2,690,000
Postretirement Benefits [Member]
Employer contributions	10,000
Contributions expected to be made by Company in next fiscal year	$ 50,000		$ 50,000