Note H - Revenue - Disaggregation of Revenue (Details) - USD ($)	3 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Net Sales	$ 40,975,320	$ 48,193,318
Coil [Member]
Net Sales	28,181,468	31,129,200
Coil [Member] | Prime Coil [Member]
Net Sales	24,228,453	24,776,031
Coil [Member] | Secondary Coil [Member]
Net Sales	3,772,515	6,110,458
Coil [Member] | Customer Owned [Member]
Net Sales	180,500	242,711
Tubular [Member]
Net Sales	12,793,852	17,064,118
Tubular [Member] | Manufactured Pipe [Member]
Net Sales	10,732,487	10,955,387
Tubular [Member] | Mill Reject Pipe [Member]
Net Sales	2,061,365	5,420,861
Tubular [Member] | Pipe Finishing Services [Member]
Net Sales		$ 687,870