Note J - Segment Information - Segment Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Mar. 31, 2022
Net Sales	$ 149,692,409	$ 92,570,895	$ 311,495,499	$ 158,487,334
Operating profit (loss)	(550,657)	24,332,631	11,339,098	38,289,246
Interest expense	621,215	72,296	1,050,596	95,506
Other income (loss), net	3,756,174	(6,840,317)	6,523,877	(6,528,255)
EARNINGS BEFORE INCOME TAXES	3,205,517	17,492,314	17,862,975	31,760,991
Assets	211,846,535		211,846,535		$ 159,275,070
Operating Segments [Member]
Operating profit (loss)	2,223,000	26,270,000	17,870,000	42,127,000
Assets	202,236,000		202,236,000		139,249,000
Corporate, Non-Segment [Member]
General corporate expenses	2,152,000	1,866,000	5,480,000	3,742,000
Assets	9,611,000		9,611,000		20,026,000
Coil [Member]
Net Sales	129,722,213	78,323,927	272,599,185	131,018,657
Coil [Member] | Operating Segments [Member]
Net Sales	129,722,000	78,324,000	272,599,000	131,019,000
Operating profit (loss)	(1,118,000)	24,273,000	12,425,000	37,529,000
Assets	181,722,000		181,722,000		115,232,000
Tubular [Member]
Net Sales	19,970,196	14,246,968	38,896,314	27,468,677
Tubular [Member] | Operating Segments [Member]
Net Sales	19,970,000	14,247,000	38,896,000	27,468,000
Operating profit (loss)	3,341,000	$ 1,997,000	5,445,000	$ 4,598,000
Assets	$ 20,514,000		$ 20,514,000		$ 24,017,000