CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES:
Net earnings	$ 91,886	$ 75,892	$ 65,308
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation	18,243	17,668	17,570
Deferred income taxes	(913)	1,535	(1,263)
Amortization of marketable security premiums	3,946	5,531	3,837
Changes in operating assets and liabilities:
Accounts receivable	4,891	(3,073)	(14,130)
Other receivables	(4,574)	(1,020)	(706)
Inventories	(9,601)	(28,415)	3,940
Prepaid expenses and other assets	(15,856)	49	2,622
Accounts payable and accrued liabilities	(3,570)	10,329	10,010
Income taxes payable	9,583	(4,565)	(1,296)
Postretirement health care benefits	(649)	(804)	(1,281)
Deferred compensation and other liabilities	1,225	(1,076)	687
Net cash provided by operating activities	94,611	72,051	85,298
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(26,796)	(23,356)	(31,426)
Repayment of premiums on split dollar life insurance policies			2,514
Purchases of trading securities	(1,875)	(1,543)	(2,668)
Sales of trading securities	774	2,806	968
Purchase of available for sale securities	(92,431)	(96,114)	(108,576)
Sale and maturity of available for sale securities	106,128	49,618	47,289
Net cash used in investing activities	(14,200)	(68,589)	(91,899)
CASH FLOWS FROM FINANCING ACTIVITIES:
Shares purchased and retired	(33,114)	(31,910)	(30,184)
Dividends paid in cash	(25,076)	(24,629)	(24,136)
Proceeds from bank loans	3,499	3,989	3,792
Repayment of bank loans	(3,489)	(3,850)	(3,618)
Net cash used in financing activities	(58,180)	(56,400)	(54,146)
Effect of exchange rate changes on cash	424	347	(283)
Increase (decrease) in cash and cash equivalents	22,655	(52,591)	(61,030)
Cash, cash equivalents and restricted cash at beginning of year	53,635	106,226	167,256
Cash, cash equivalents and restricted cash at end of year	76,290	53,635	106,226
Supplemental cash flow information:
Income taxes paid	19,583	23,884	22,855
Interest paid	258	78	6
Stock dividend issued	$ 86,433	$ 70,242	$ 64,667