Consolidated Statements Of Cash Flows (USD $)	9 Months Ended
	Sep. 30, 2012	Oct. 02, 2011
Cash flows from operating activities:
Net earnings	$ 27,448,000	$ 34,566,000
Adjustments to reconcile net earnings to net Cash provided by operating activities:
Provision for depreciation	7,568,000	6,608,000
Provision for doubtful accounts	3,340,000	188,000
Other	766,000	470,000
Changes in:
Accounts receivable	707,000	21,277,000
Inventories	(6,969,000)	(6,241,000)
Other current assets	5,743,000	(7,375,000)
Accounts payable and accrued liabilities	(2,252,000)	(11,500,000)
Federal and state income taxes	(1,784,000)	(2,187,000)
Net cash provided by operating activities	34,567,000	35,806,000
Cash flows from investing activities:
Marketable securities purchased	(18,285,000)	(32,479,000)
Marketable securities - maturities and sales	24,466,000	62,103,000
Acquisition of property, plant and equipment	(9,931,000)	(12,503,000)
Notes issued	(3,500,000)	(160,000)
Acquisition of business	(246,000)	0
Sale of property, plant and equipment	7,000	5,000
Net cash provided by (used in) investing activities	(7,489,000)	16,966,000
Cash flows from financing activities:
Dividends paid	(41,292,000)	(56,665,000)
Other	357,000	439,000
Net cash used in financing activities	(40,935,000)	(56,226,000)
Net decrease in cash and cash equivalents	(13,857,000)	(3,454,000)
Cash and cash equivalents at beginning of period	73,995,000	49,719,000
Cash and cash equivalents at end of period	$ 60,138,000	$ 46,265,000