Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Statement [Abstract]
Net sales	$ 565,568	$ 505,198	$ 425,544
Cost of sales	345,598	299,714	257,295
Gross margin	219,970	205,484	168,249
Selling, engineering and administration	132,675	126,761	103,093
Operating earnings	87,295	78,723	65,156
Interest (income) expense, net	(552)	(20)	30
Other pension and postretirement costs	130	120	145
Earnings before income taxes	87,717	78,623	64,981
Provision for income taxes	21,221	17,739	15,638
Net earnings	$ 66,496	$ 60,884	$ 49,343
Earnings per share:
Basic	$ 2.28	$ 2.09	$ 1.70
Diluted	$ 2.26	$ 2.08	$ 1.69
Shares used in computation of earnings per share:
Basic	29,218	29,144	29,052
Impact of dilutive securities	158	194	178
Diluted	29,376	29,338	29,230