Note F - Property, Plant and Equipment (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Mar. 31, 2024
Construction in Progress, Gross	$ 805		$ 805		$ 805	$ 1,977
Gain (Loss) on Disposition of Property Plant Equipment	(222)	$ (0)	(222)	$ (0)	(200)
Building Expansion Project [Member]
Construction in Progress, Gross	800		800		800
Upgrade of Decatur, AL Processing Line [Member]
Construction in Progress, Gross	$ 1,900		$ 1,900		$ 1,900