Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities:
Net earnings	$ 25,654,000	$ 46,958,000	$ 42,220,000
Adjustments to reconcile net earnings to net cash provided by operating activities:
Provision for depreciation	2,764,000	2,784,000	3,606,000
Intangibles amortization	214,000	221,000	83,000
Deferred income tax (benefit)	(1,612,000)	(1,718,000)	(224,000)
Noncash income tax expense			1,370,000
Loss on disposal and impairment of property, plant and equipment	493,000	2,000	322,000
Provision for doubtful notes and accounts receivable	7,665,000		7,000
Proceeds from insurance claim	823,000		0
Noncash retirement plan expense	752,000	721,000	680,000
Gain on legal settlement			(2,300,000)
Other	100,000	131,000	464,000
Changes in operating accounts, net of effects of acquisition:
Accounts receivable, net	1,083,000	(12,203,000)	10,915,000
Inventories	(10,139,000)	(6,952,000)	(34,241,000)
Other assets and current assets	9,737,000	(5,655,000)	(2,803,000)
Accounts payable and accrued liabilities	(1,232,000)	15,706,000	(11,561,000)
Federal and state income taxes receivable/payable	(1,614,000)	978,000	1,045,000
Net cash provided by operating activities	34,688,000	40,973,000	9,583,000
Cash flows from investing activities:
Marketable securities purchased	(3,918,000)	(48,047,000)	(105,409,000)
Marketable securities - maturities and sales	38,539,000	57,823,000	161,420,000
Proceeds from divestiture of businesses, net of cash paid	0	0	0
Purchase of property, plant and equipment	(2,866,000)	(2,621,000)	(3,138,000)
Proceeds from notes receivable	543,000	0	2,146,000
Acquisition of business, net of cash acquired	0	0	(3,733,000)
Proceeds from legal settlement	0	0	2,300,000
Proceeds from insurance claim	250,000	0	807,000
Sale of property, plant and equipment	0	0	767,000
Net cash provided by investing activities	32,548,000	7,155,000	55,160,000
Cash flows from financing activities:
Dividends paid	(44,083,000)	(42,172,000)	(42,087,000)
Proceeds from sale of treasury stock	571,000	528,000	518,000
Other	45,000	(27,000)	(442,000)
Net cash used in financing activities	(43,467,000)	(41,671,000)	(42,011,000)
Net increase in cash and cash equivalents	23,769,000	6,457,000	22,732,000
Cash and cash equivalents at beginning of year	86,036,000	79,579,000	56,847,000
Cash and cash equivalents at end of year	109,805,000	86,036,000	79,579,000
Supplemental disclosures of cash flow information:
Income taxes	$ 10,071,000	$ 13,803,000	$ 10,187,000