Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Net sales	$ 654,233	$ 543,494
Cost of sales	470,780	409,111
Gross profit	183,453	134,383
Research and development costs	20,238	21,891
Selling, general and administrative expenses	92,342	86,612
Restructuring charges	7,322	1,201
Gain on sale of property	(1,596)	(6,578)
Income from operations	65,147	31,257
Interest expense	(3,379)	(3,542)
Other expense, net	(2,709)	(388)
Earnings before provision for income taxes	59,059	27,327
Provision for income taxes	6,370	2,506
Net earnings available to common shareholders	52,689	24,821
Common Class A [Member]
Net earnings available to common shareholders	$ 8,598	$ 4,076
Net earnings per common share:
common shares - basic and diluted (in dollars per share)	$ 4.01	$ 1.90
Weighted-average shares outstanding:
common shares - basic and diluted (in shares)	2,143	2,145
Common Class B [Member]
Net earnings available to common shareholders	$ 44,091	$ 20,745
Net earnings per common share:
common shares - basic and diluted (in dollars per share)	$ 4.24	$ 2.02
Weighted-average shares outstanding:
common shares - basic and diluted (in shares)	10,394	10,258