Note J - Segment Information - Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Mar. 31, 2023
Net Sales	$ 130,748	$ 149,692	$ 268,046	$ 311,495
Operating profit (loss)	1,055	71	11,412	12,390
Gain on economic hedges of risk	4,402	3,749	4,832	6,504
Interest expense	(805)	(621)	(1,345)	(1,051)
Other income	10	7	16	20
EARNINGS BEFORE INCOME TAXES	4,662	3,206	14,915	17,863
Assets	222,127		222,127		$ 199,312
Operating Segments [Member]
Operating profit (loss)	3,158	2,223	17,236	17,870
Assets	216,979		216,979		195,638
Corporate, Non-Segment [Member]
General corporate expenses	(2,103)	(2,152)	(5,824)	(5,480)
Assets	5,148		5,148		3,674
Coil [Member]
Net Sales	120,527	129,722	245,724	272,599
Coil [Member] | Operating Segments [Member]
Net Sales	120,527	129,722	245,724	272,599
Operating profit (loss)	3,142	(1,118)	14,956	12,425
Assets	197,279		197,279		179,780
Tubular [Member]
Net Sales	10,221	19,970	22,322	38,896
Tubular [Member] | Operating Segments [Member]
Net Sales	10,221	19,970	22,322	38,896
Operating profit (loss)	16	$ 3,341	2,280	$ 5,445
Assets	$ 19,700		$ 19,700		$ 15,858