Note K - Revenue - Disaggregation of Revenue (Details) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Net Sales	$ 92,570,895	$ 24,861,680	$ 158,487,334	$ 48,386,280
Coil [Member]
Net Sales	78,323,927	18,456,086	131,018,657	33,888,870
Coil [Member] | Prime Coil [Member]
Net Sales	74,928,149	17,049,230	124,507,742	30,356,698
Coil [Member] | Secondary Coil [Member]
Net Sales	3,028,787	1,201,135	5,851,990	3,142,138
Coil [Member] | Customer Owned [Member]
Net Sales	366,991	205,721	658,925	390,034
Tubular [Member]
Net Sales	14,246,968	6,405,594	27,468,677	14,497,410
Tubular [Member] | Manufactured Pipe [Member]
Net Sales	11,376,626	5,296,334	20,983,436	12,458,184
Tubular [Member] | Mill Reject Pipe [Member]
Net Sales	$ 2,870,342	$ 1,109,260	$ 6,485,241	$ 2,039,226