Consolidated Condensed Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Statement [Abstract]
Net sales	$ 148,009	$ 128,738	$ 418,244	$ 369,449
Cost of sales	90,487	77,554	255,239	218,801
Gross margin	57,522	51,184	163,005	150,648
Selling, engineering and administration	33,651	31,744	98,184	94,786
Operating earnings	23,871	19,440	64,821	55,862
Interest (income) expense, net	(108)	14	(86)	28
Other pension and postretirement costs	32	30	97	90
Earnings before income taxes	23,947	19,396	64,810	55,744
Provision for income taxes	6,014	3,541	15,853	12,136
Net earnings	$ 17,933	$ 15,855	$ 48,957	$ 43,608
Earnings per share:
Basic	$ 0.61	$ 0.54	$ 1.68	$ 1.50
Diluted	0.61	0.54	1.67	1.49
Dividends declared per common share	$ 0.23	$ 0.20	$ 0.63	$ 0.56
Shares used in computation of earnings per share:
Basic	29,215,982	29,157,628	29,211,488	29,124,491
Impact of dilutive securities	156,482	184,204	151,609	200,043
Diluted	29,372,464	29,341,832	29,363,097	29,324,534