Consolidated Statements Of Cash Flows - USD ($)	6 Months Ended
	Jul. 01, 2018	Jul. 02, 2017
Cash flows from operating activities:
Net earnings	$ 21,761,000	$ 27,867,000
Adjustments to reconcile net earnings to net cash provided by operating activities:
Provision for depreciation	2,057,000	3,912,000
Intangibles amortization	2,161,000	372,000
Provision for doubtful accounts	12,000	14,000
Noncash retirement plan expense	379,000	357,000
Gain on involuntary conversion of machinery and equipment		(1,997,000)
Gain on disposal of property, plant and equipment		(2,000)
Gain on divestiture of business		(11,413,000)
Other	139,000	133,000
Changes in operating accounts:
Accounts receivable, net	21,469,000	29,060,000
Inventories	6,791,000	(21,191,000)
Other assets and current assets	275,000	(3,099,000)
Accounts payable and accrued liabilities	(847,000)	(9,675,000)
Federal and state income taxes	(4,371,000)	(8,656,000)
Net cash provided by operating activities	49,826,000	5,682,000
Cash flows from investing activities:
Marketable securities purchased	(59,771,000)	(109,465,000)
Marketable securities - maturities and sales	74,666,000	65,250,000
Proceeds from divestiture of business, net of cash paid	3,660,000	64,033,000
Purchase of property, plant and equipment	(4,001,000)	(4,509,000)
Proceeds from insurnace settlement	2,474,000
Sale of property, plant and equipment	1,000	1,000
Net cash provided by investing activities	17,029,000	15,310,000
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	25,388,000	(17,008,000)
Cash and cash equivalents at beginning of period	11,222,000	27,034,000
Cash and cash equivalents at end of period	$ 36,610,000	$ 10,026,000