CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
CASH FLOWS FROM OPERATING ACTIVITIES:
Net earnings	$ 99,982	$ 86,808	$ 91,886
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation	19,067	18,176	18,243
Deferred income taxes	11,605	7,758	(913)
Amortization of marketable security premiums and discounts, net	(5,388)	1,829	3,946
Changes in operating assets and liabilities:
Accounts receivable	(3,285)	10,226	4,891
Other receivables	979	1,444	(4,574)
Inventories	3,421	15,790	(9,601)
Prepaid expenses and other assets	(274)	2,559	(15,856)
Accounts payable and accrued liabilities	(448)	635	(3,570)
Income taxes payable	6,222	(7,664)	9,583
Postretirement health care benefits	(801)	(253)	(649)
Deferred compensation and other liabilities	(466)	1,581	1,225
Net cash provided by operating activities	130,614	138,889	94,611
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(34,263)	(17,997)	(26,796)
Purchases of trading securities	(2,251)	(2,257)	(1,875)
Sales of trading securities	2,127	1,314	774
Purchase of available for sale securities	(133,688)	(108,728)	(92,431)
Sale and maturity of available for sale securities	57,529	91,826	106,128
Net cash used in investing activities	(110,546)	(35,842)	(14,200)
CASH FLOWS FROM FINANCING ACTIVITIES:
Shares purchased and retired	(6,482)	(13,534)	(33,114)
Dividends paid in cash	(26,066)	(25,515)	(25,076)
Proceeds from bank loans	3,068	3,828	3,499
Repayment of bank loans	(3,069)	(3,928)	(3,489)
Net cash used in financing activities	(32,549)	(39,149)	(58,180)
Effect of exchange rate changes on cash	852	(995)	424
Increase (decrease) in cash and cash equivalents	(11,629)	62,903	22,655
Cash, cash equivalents and restricted cash at beginning of year	139,193	76,290	53,635
Cash, cash equivalents and restricted cash at end of year	127,564	139,193	76,290
Supplemental cash flow information:
Income taxes paid, net	25,139	38,165	19,583
Interest paid	195	268	258
Stock dividend issued	$ 66,289	$ 66,243	$ 86,433