3. Employee Retirement Benefit Plans: Schedule of Net Periodic Benefit Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2015	Sep. 26, 2014	Oct. 02, 2015	Sep. 26, 2014
Pension Expenses for the period	$ 49	$ 359	$ 473	$ 777
Pension Plan
Service cost	0	0	0	0
Interest cost	0	569	617	1,706
Expected return on assets	0	(574)	(585)	(1,724)
Amortization of actuarial loss	0	101	195	304
Amortization of prior year service cost	0	0	0	0
Net periodic benefit cost	0	96	227	286
Insurance premium due PBGC	0	208	99	326
Pension Expenses for the period	0	304	326	612
Supplemental Executive Retirement Plan
Service cost	0	0	0	0
Interest cost	44	55	132	164
Expected return on assets	0	0	0	0
Amortization of actuarial loss	17	12	51	37
Amortization of prior year service cost	(12)	(12)	(36)	(36)
Net periodic benefit cost	49	55	147	165
Insurance premium due PBGC	0	0	0	0
Pension Expenses for the period	$ 49	$ 55	$ 147	$ 165