Retirement Benefit Plans, Defined Contribution Plan (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
Defined Contribution Plan Disclosure [Line Items]
Total contributions made for the period	$ 230,313	$ 117,365	$ 789,727	$ 225,066
Regular Matching Contributions [Member]
Defined Contribution Plan Disclosure [Line Items]
Total contributions made for the period	118,947	75,817	235,423	132,048
Transitional Credit Contributions [Member]
Defined Contribution Plan Disclosure [Line Items]
Total contributions made for the period	95,702	41,548	231,072	41,548
Non-discretionary Contributions [Member]
Defined Contribution Plan Disclosure [Line Items]
Total contributions made for the period	$ 15,664	$ 0	$ 323,232	$ 51,470
Plan 401 K Plan Amendment [Member]
Defined Contribution Plan Disclosure [Line Items]
Percentage of voluntary contributions allowed to participants, maximum			100.00%