CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common stock	Capital in Excess of Par Value	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Total
Balance at Dec. 31, 2020	$ 3,387		$ 83,079	$ (1,947)	$ 84,519
Balance (in shares) at Dec. 31, 2020	33,869,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issued for stock incentive plans, net	$ 18	$ 535			553
Stock issued for stock incentive plans, net (in shares)	189,000
Stock purchased and retired	$ (6)	(535)	(509)		(1,050)
Stock purchased and retired (in shares)	(64,000)
Net income			8,097		8,097
Pension adjustment, net of taxes				14	14
Dividends declared			(3,398)		(3,398)
Balance at Mar. 31, 2021	$ 3,399		87,269	(1,933)	88,735
Balance (in shares) at Mar. 31, 2021	33,994,000
Balance at Dec. 31, 2021	$ 3,399		97,702	(2,576)	$ 98,525
Balance (in shares) at Dec. 31, 2021	33,993,000				33,992,054
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issued for stock incentive plans, net	$ 21	589			$ 610
Stock issued for stock incentive plans, net (in shares)	211,000
Stock purchased and retired	$ (6)	$ (589)	(107)		(702)
Stock purchased and retired (in shares)	(60,000)
Net income			7,063		7,063
Pension adjustment, net of taxes				22	22
Dividends declared			(4,095)		(4,095)
Balance at Mar. 31, 2022	$ 3,414		$ 100,563	$ (2,554)	$ 101,423
Balance (in shares) at Mar. 31, 2022	34,144,000				34,142,479