Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net earnings	$ 20,699,000	$ 25,654,000	$ 46,958,000
Adjustments to reconcile net earnings to net cash provided by operating activities:
Provision for depreciation	2,765,000	2,764,000	2,784,000
Intangibles amortization	582,000	214,000	221,000
Deferred income tax (benefit)	(2,311,000)	(1,612,000)	(1,718,000)
Provision for doubtful notes and accounts receivable	0	7,665,000	0
Loss on disposal of property, plant and equipment	463,000	493,000	2,000
Loss on impairment	5,295,000	0	0
Proceeds from insurance claim	151,000	823,000	0
Noncash retirement plan expense	803,000	752,000	721,000
Gain on bargain purchase	(492,000)	0	0
Other	514,000	100,000	131,000
Changes in operating accounts, net of effects of acquisition:
Accounts receivable, net	(12,903,000)	1,083,000	(12,203,000)
Inventories	(5,620,000)	(10,139,000)	(6,952,000)
Other assets and current assets	147,000	9,737,000	(5,655,000)
Accounts payable and accrued liabilities	(676,000)	(1,232,000)	15,706,000
Federal and state income taxes receivable/payable	(649,000)	(1,614,000)	978,000
Net cash provided by operating activities	8,768,000	34,688,000	40,973,000
Cash flows from investing activities:
Marketable securities purchased	(20,024,000)	(3,918,000)	(48,047,000)
Marketable securities - maturities and sales	29,195,000	38,539,000	57,823,000
Purchase of property, plant and equipment	(1,030,000)	(2,866,000)	(2,621,000)
Proceeds from notes receivable	106,000	543,000	0
Acquisition of businesses, net of cash acquired	(24,683,000)	0	0
Proceeds from insurance claim	0	250,000	0
Net cash provided by (used in) investing activities	(16,436,000)	32,548,000	7,155,000
Cash flows from financing activities:
Dividends paid	(31,826,000)	(44,083,000)	(42,172,000)
Proceeds from sale of treasury stock	436,000	571,000	528,000
Other	(36,000)	45,000	(27,000)
Net cash used in financing activities	(31,426,000)	(43,467,000)	(41,671,000)
Net increase (decrease) in cash and cash equivalents	(39,094,000)	23,769,000	6,457,000
Cash and cash equivalents at beginning of year	109,805,000	86,036,000	79,579,000
Cash and cash equivalents at end of year	70,711,000	109,805,000	86,036,000
Supplemental disclosures of cash flow information:
Income taxes	$ 8,208,000	$ 10,071,000	$ 13,803,000