3. Employee Retirement Benefit Plans: Schedule of Net Periodic Benefit Expense (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jul. 01, 2016	Jul. 03, 2015	Apr. 03, 2015	Jul. 01, 2016	Jul. 03, 2015
Pension	$ 65	$ 49		$ 131	$ 424
Pension Plan
Service cost	0	0		0	0
Interest cost	0	0		0	617
Expected return on assets	0	0		0	(585)
Amortization of actuarial loss	0	0		0	195
Amortization of prior year service cost	0	0		0	0
Net periodic benefit cost	0	0		0	227
Insurance premium due PBGC	0	0		0	99
Pension	0	0	$ 326	0	326
Supplemental Executive Retirement Plan
Service cost	0	0		0	0
Interest cost	48	44		95	88
Expected return on assets	0	0		0	0
Amortization of actuarial loss	20	17		41	34
Amortization of prior year service cost	(3)	(12)		(5)	(24)
Net periodic benefit cost	65	49		131	98
Insurance premium due PBGC	0	0		0	0
Pension	$ 65	$ 49		$ 131	$ 98