Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Net sales	$ 128,090	$ 172,344
Cost of sales	80,012	118,680
Gross profit	48,078	53,664
Research and development costs	5,215	5,223
Selling, general and administrative expenses	24,944	25,296
Restructuring charges	65	3,507
Income from operations	17,854	19,638
Interest expense	(434)	(983)
Interest income	1,115	107
Other income/expense, net	1,817	(26)
Earnings before provision for income taxes	20,352	18,736
Provision for income taxes	4,478	4,164
Net earnings available to common stockholders	15,874	14,572
Common Class A [Member]
Net earnings available to common stockholders	$ 2,545	$ 2,331
Net earnings per common share:
Net earnings per common share - basic and diluted (in dollars per share)	$ 1.19	$ 1.09
Weighted-average number of shares outstanding:
Weighted-average number of shares outstanding - basic and diluted (in shares)	2,139	2,142
Common Class B [Member]
Net earnings available to common stockholders	$ 13,329	$ 12,241
Net earnings per common share:
Net earnings per common share - basic and diluted (in dollars per share)	$ 1.26	$ 1.15
Weighted-average number of shares outstanding:
Weighted-average number of shares outstanding - basic and diluted (in shares)	10,610	10,639