Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Net sales	$ 123,638	$ 158,682	$ 384,933	$ 499,803
Cost of sales	78,961	103,217	238,782	335,137
Gross profit	44,677	55,465	146,151	164,666
Research and development costs	5,443	5,292	16,652	16,521
Selling, general and administrative expenses	26,700	23,717	75,785	74,149
Restructuring charges	1,087	2,091	1,790	6,306
Gain on sale of property	0	(147)	0	(3,819)
Income from operations	11,447	24,512	51,924	71,509
Gain on sale of Czech Republic business	0	(135)	0	980
Interest expense	(414)	(512)	(1,263)	(2,402)
Interest income	1,480	0	3,741	0
Other (expense) income, net	(1,325)	(96)	21	(286)
Earnings before provision for income taxes	11,188	23,769	54,423	69,801
Provision for income taxes	3,108	4,321	11,663	8,006
Net earnings available to common stockholders	8,080	19,448	42,760	61,795
Common Class A [Member]
Net earnings available to common stockholders	$ 1,297	$ 3,117	$ 6,872	$ 9,907
Net earnings per common share:
Net earnings per common share - basic and diluted (in dollars per share)	$ 0.61	$ 1.46	$ 3.23	$ 4.63
Weighted-average number of shares outstanding:
Weighted-average number of shares outstanding - basic and diluted (in shares)	2,116	2,142	2,126	2,142
Common Class B [Member]
Net earnings available to common stockholders	$ 6,783	$ 16,331	$ 35,888	$ 51,888
Net earnings per common share:
Net earnings per common share - basic and diluted (in dollars per share)	$ 0.65	$ 1.54	$ 3.41	$ 4.88
Weighted-average number of shares outstanding:
Weighted-average number of shares outstanding - basic and diluted (in shares)	10,434	10,636	10,512	10,636