Retirement Benefit Plans, Defined Contribution Plan (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
Defined Contribution Plan Disclosure [Line Items]
Total contributions made for the period	$ 203,804	$ 188,910	$ 993,530	$ 413,976
Regular Matching Contribution [Member]
Defined Contribution Plan Disclosure [Line Items]
Total contributions made for the period	111,291	94,042	346,713	226,090
Transitional Credit Contribution [Member]
Defined Contribution Plan Disclosure [Line Items]
Total contributions made for the period	76,526	94,868	307,597	136,416
Non-discretionary Contribution [Member]
Defined Contribution Plan Disclosure [Line Items]
Total contributions made for the period	$ 15,987	$ 0	$ 339,220	$ 51,470