Note K - Revenue - Disaggregation of Revenue (Details) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Net Sales	$ 28,502,049	$ 28,150,817	$ 76,888,329	$ 109,121,717
Coil [Member]
Net Sales	21,672,147	21,001,358	55,561,017	77,603,435
Coil [Member] | Prime Coil [Member]
Net Sales	19,541,188	18,662,211	49,897,886	67,827,299
Coil [Member] | Secondary Coil [Member]
Net Sales	1,886,099	2,153,277	5,028,237	9,197,245
Coil [Member] | Customer Owned [Member]
Net Sales	244,860	185,870	634,894	578,891
Tubular [Member]
Net Sales	6,829,902	7,149,459	21,327,312	31,518,282
Tubular [Member] | Manufactured Pipe [Member]
Net Sales	5,082,314	5,748,647	17,540,498	26,225,323
Tubular [Member] | Mill Reject Pipe [Member]
Net Sales	$ 1,747,588	$ 1,400,812	$ 3,786,814	$ 5,292,959