Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	6 Months Ended
	Jun. 29, 2013	Jun. 30, 2012
Cash flows from operating activities:
Cash received from customers	$ 225,418,000	$ 215,636,000
Cash paid to suppliers and employees	(201,291,000)	(194,550,000)
Interest and dividends received	80,000	229,000
Interest paid	(43,000)	(43,000)
Income taxes paid	(8,705,000)	(3,914,000)
Cash paid for exit activity	(130,000)	(2,240,000)
Net cash provided by operating activities	15,329,000	15,118,000
Cash flows from investing activities:
Capital expenditures	(5,115,000)	(1,792,000)
Purchases of investments	(15,639,000)	(81,981,000)
Sales of investments	1,745,000	51,902,000
Proceeds from the sale of property, plant and equipment	105,000	20,000
Net cash used in investing activities	(18,904,000)	(31,851,000)
Cash flows from financing activities:
Cash dividends paid	(1,536,000)	(1,536,000)
Net cash used in financing activities	(1,536,000)	(1,536,000)
Net decrease in cash and cash equivalents	(5,111,000)	(18,269,000)
Cash and cash equivalents at beginning of period	16,037,000	30,675,000
Cash and cash equivalents at end of period	10,926,000	12,406,000
Reconciliation of Net Income to Net Cash Provided by Operating Activities:
Net income	9,200,000	7,811,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	2,322,000	2,523,000
Provision for losses on accounts receivable	14,000	22,000
Net loss from the disposal of property, plant and equipment	69,000	131,000
Realized gain on investments, net	(17,000)	0
Amortization of premium on investments	123,000	155,000
Stock appreciation rights compensation expense (income)	1,110,000	(434,000)
(Increase) decrease in assets:
Accounts receivable	676,000	683,000
Inventories	3,829,000	3,467,000
Other current assets	1,245,000	663,000
Other assets	(8,000)	13,000
Increase (decrease) in liabilities:
Accounts payable, trade and other current liabilities	(743,000)	(10,000)
Income taxes payable	(2,379,000)	1,456,000
Deferred rent	113,000	(494,000)
Other liabilities	(225,000)	(868,000)
Net cash provided by operating activities	$ 15,329,000	$ 15,118,000