Note J - Segment Information - Segment Information (Details) - USD ($)	3 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2021
Revenue from Contract with Customer, Including Assessed Tax	$ 65,916,439	$ 23,524,600
Operating profit (loss)	13,956,615	(1,140,953)
General corporate expenses	1,876,000	735,000
Interest expense	23,210	5,953
Other income, net	312,062	4,323
Total earnings (loss) before income taxes	14,268,677	(1,136,630)
Segment assets	155,566,855		$ 95,008,809
Coil [Member]
Revenue from Contract with Customer, Including Assessed Tax	52,694,730	15,432,784
Tubular [Member]
Revenue from Contract with Customer, Including Assessed Tax	13,221,709	8,091,816
Operating Segments [Member]
Operating profit (loss)	15,856,000	(400,000)
Segment assets	124,922,000		74,554,000
Operating Segments [Member] | Coil [Member]
Revenue from Contract with Customer, Including Assessed Tax	52,695,000	15,433,000
Operating profit (loss)	13,256,000	(459,000)
Segment assets	109,328,000		56,670,000
Operating Segments [Member] | Tubular [Member]
Revenue from Contract with Customer, Including Assessed Tax	13,221,000	8,092,000
Operating profit (loss)	2,600,000	$ 59,000
Segment assets	15,594,000		17,884,000
Corporate, Non-Segment [Member]
Segment assets	$ 30,645,000		$ 20,455,000