Note I - Revenue - Disaggregation of Revenue (Details) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Net sales	$ 28,150,817	$ 43,326,080	$ 109,121,717	$ 144,951,427
Coil [Member]
Net sales	21,001,358	28,730,992	77,603,435	94,688,636
Coil [Member] | Prime Coil [Member]
Net sales	18,662,211	25,074,965	67,827,299	79,426,810
Coil [Member] | Secondary Coil [Member]
Net sales	2,153,277	3,350,738	9,197,245	14,355,617
Coil [Member] | Customer Owned [Member]
Net sales	185,870	305,289	578,891	906,209
Tubular [Member]
Net sales	7,149,459	14,595,088	31,518,282	50,262,791
Tubular [Member] | Manufactured Pipe [Member]
Net sales	5,748,647	10,767,166	26,225,323	35,936,762
Tubular [Member] | Mill Reject Pipe [Member]
Net sales	1,400,812	3,761,188	5,292,959	13,489,029
Tubular [Member] | Pipe Finishing Services [Member]
Net sales		$ 66,734		$ 837,000