Note K - Revenue - Disaggregation of Revenue (Details) - USD ($)	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Net Sales	$ 23,524,600	$ 40,975,320
Coil [Member]
Net Sales	15,432,784	28,181,468
Coil [Member] | Prime Coil [Member]
Net Sales	13,307,468	24,228,453
Coil [Member] | Secondary Coil [Member]
Net Sales	1,941,003	3,772,515
Coil [Member] | Customer Owned [Member]
Net Sales	184,313	180,500
Tubular [Member]
Net Sales	8,091,816	12,793,852
Tubular [Member] | Manufactured Pipe [Member]
Net Sales	7,161,850	10,732,487
Tubular [Member] | Mill Reject Pipe [Member]
Net Sales	929,966	2,061,365
Tubular [Member] | Pipe Finishing Services [Member]
Net Sales