Note J - Segment Information (Details Textual) - USD ($)	3 Months Ended	6 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2020
Gain (Loss) on Extinguishment of Debt, Total		$ 1,706,614	$ (0)
Paycheck Protection Program CARES Act [Member]
Gain (Loss) on Extinguishment of Debt, Total		1,706,614
Nonoperating Income (Expense) [Member] | Paycheck Protection Program CARES Act [Member]
Gain (Loss) on Extinguishment of Debt, Total		1,706,614
Nonoperating Income (Expense) [Member] | Hot-rolled Coil Steel Contracts [Member]
Derivative Instruments Not Designated as Hedging Instruments, Loss	$ 6,830,780	$ 8,219,740