Consolidated Condensed Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Statement [Abstract]
Net sales	$ 137,833	$ 122,869	$ 270,235	$ 240,711
Cost of sales	83,073	72,767	164,752	141,247
Gross margin	54,760	50,102	105,483	99,464
Selling, engineering and administration	32,672	31,427	64,533	63,042
Operating earnings	22,088	18,675	40,950	36,422
Interest expense, net	9	7	22	14
Other pension and postretirement costs	33	29	65	60
Earnings before income taxes	22,046	18,639	40,863	36,348
Provision for income taxes	5,382	4,667	9,839	8,595
Net earnings	$ 16,664	$ 13,972	$ 31,024	$ 27,753
Earnings per share:
Basic	$ 0.57	$ 0.48	$ 1.06	$ 0.95
Diluted	0.57	0.48	1.06	0.95
Dividends declared per common share	$ 0.20	$ 0.18	$ 0.40	$ 0.36
Shares used in computation of earnings per share:
Basic	29,210,444	29,114,346	29,204,535	29,105,429
Impact of dilutive securities	133,907	197,828	149,173	207,963
Diluted	29,344,351	29,312,174	29,353,708	29,313,392