Consolidated Statements Of Cash Flows - USD ($)	9 Months Ended
	Sep. 30, 2018	Oct. 01, 2017
Cash flows from operating activities:
Net earnings	$ 28,132,000	$ 36,199,000
Adjustments to reconcile net earnings to net cash provided by (used in) operating activities:
Provision for depreciation	3,079,000	5,211,000
Intangibles amortization	2,166,000	1,851,000
Provision for doubtful accounts	18,000	41,000
Noncash retirement plan expense	527,000	504,000
Gain on involuntary conversion of machinery and equipment		(1,997,000)
Loss on disposal of property, plant and equipment		14,000
Impairment of long-lived assets	3,021,000
Gain on divestiture of business		(11,413,000)
Other	86,000	292,000
Changes in operating accounts:
Accounts receivable, net	20,958,000	22,560,000
Inventories	6,816,000	(33,834,000)
Other assets and current assets	2,208,000	(1,543,000)
Accounts payable and accrued liabilities	8,666,000	(12,223,000)
Federal and state income taxes	(5,698,000)	(11,114,000)
Net cash provided by (used in) operating activities	69,979,000	(5,452,000)
Cash flows from investing activities:
Marketable securities purchased	(84,753,000)	(121,723,000)
Marketable securities - maturities and sales	126,532,000	84,942,000
Proceeds from divestiture of business, net of cash paid	3,660,000	64,033,000
Purchase of property, plant and equipment	(7,110,000)	(5,707,000)
Acquisition of intangible assets		(1,000,000)
Proceeds from insurnace settlement	2,474,000	1,997,000
Sale of property, plant and equipment	1,000	1,000
Net cash provided by investing activities	40,804,000	22,543,000
Cash flows from financing activities:
Dividends paid	(41,989,000)	(38,405,000)
Proceeds from sale of treasury stock	528,000	519,000
Other	(6,000)	(114,000)
Net cash used in financing activities	(41,467,000)	(38,000,000)
Net increase (decrease) in cash and cash equivalents	69,316,000	(20,909,000)
Cash and cash equivalents at beginning of period	11,222,000	27,034,000
Cash and cash equivalents at end of period	$ 80,538,000	$ 6,125,000