Note J - Segment Information - Segment Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Mar. 31, 2021
Revenue from Contract with Customer, Including Assessed Tax	$ 51,655,943	$ 28,502,049	$ 210,143,277	$ 76,888,329
Operating profit (loss)	(5,656,648)	2,764,558	32,632,598	1,306,559
Corporate expenses	920,000	736,000	4,662,000	2,188,000
Interest expense	58,385	6,148	153,891	18,356
Other income (loss), net	1,727,134	4,339	(4,801,121)	12,987
Total earnings (loss) before income taxes	(3,929,514)	2,768,897	27,831,477	1,319,546
Segment assets	150,440,012		150,440,012		$ 95,008,809
Coil [Member]
Revenue from Contract with Customer, Including Assessed Tax	41,795,586	21,672,147	172,814,243	55,561,017
Tubular [Member]
Revenue from Contract with Customer, Including Assessed Tax	9,860,357	6,829,902	37,329,034	21,327,312
Operating Segments [Member]
Operating profit (loss)	(4,679,000)	3,507,000	37,448,000	3,513,000
Segment assets	145,413,000		145,413,000		74,554,000
Operating Segments [Member] | Coil [Member]
Revenue from Contract with Customer, Including Assessed Tax	41,795,000	21,672,000	172,814,000	55,561,000
Operating profit (loss)	(4,032,000)	3,238,000	33,497,000	3,529,000
Segment assets	119,705,000		119,705,000		56,670,000
Operating Segments [Member] | Tubular [Member]
Revenue from Contract with Customer, Including Assessed Tax	9,861,000	6,830,000	37,329,000	21,327,000
Operating profit (loss)	(647,000)	$ 269,000	3,951,000	$ (16,000)
Segment assets	25,708,000		25,708,000		17,884,000
Corporate, Non-Segment [Member]
Segment assets	$ 5,027,000		$ 5,027,000		$ 20,455,000