Consolidated Condensed Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Net sales	$ 108,508	$ 104,881
Cost of sales	65,186	64,424
Gross margin	43,322	40,457
Selling, engineering and administration	27,307	26,130
Operating earnings	16,015	14,327
Interest expense, net	31	129
Other pension and postretirement costs	44	47
Earnings before income taxes	15,940	14,151
Provision for income taxes	4,086	3,327
Net earnings	$ 11,854	$ 10,824
Earnings per share:
Basic	$ 0.41	$ 0.37
Diluted	0.41	0.37
Dividends declared per common share	$ 0.17	$ 0.15
Shares used in computation of earnings per share:
Basic	29,042,158	29,028,964
Impact of dilutive securities	181,757	209,660
Diluted	29,223,915	29,238,624