Note N - Interim Financial Information (Unaudited) - Quarterly Unaudited Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net Sales	$ 98,416	$ 83,141	$ 78,946	$ 80,409	$ 114,048	$ 69,683	$ 77,138	$ 60,754	$ 340,912	$ 321,623	$ 355,777
Gross Profit	20,653	15,399	13,380	18,020	13,314	17,062	15,038	9,711	67,452	55,125	64,396
Net Earnings	$ 13,159	$ 7,019	$ 5,503	$ 8,878	$ 2,173	$ 8,927	$ 6,684	$ 2,915	$ 34,559	$ 20,699	$ 25,654
First (in dollars per share)	$ 1.85	$ 0.99	$ 0.77	$ 1.25	$ 0.31	$ 1.26	$ 0.94	$ 0.41	$ 4.86	$ 2.92	$ 3.63