Note 6 - Derivative Financial Instruments (Tables)

12 Months Ended

Mar. 31, 2021

Notes Tables

Schedule of Derivative Instruments [Table Text Block]

	Asset Derivatives			Liability Derivatives
	Balance Sheet			Balance Sheet
Derivatives designated as cash flow hedges:	Location	Fair Value		Location	Fair Value
Hot-rolled coil steel contracts hedging purchases	Other current assets	$	530,640
Hot-rolled coil steel contracts hedging sales	Other current assets	$	91,760	Current portion of derivative liability	$	7,890,700
Hot-rolled coil steel contracts hedging sales				Other non-current liabilities	$	50,420
Derivatives not designated as hedging instruments:
Hot-rolled coil steel contracts				Current portion of derivative liability	$	88,680

Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block]

	Pre-Tax Loss		Location of Gain Reclassified from	Gain Reclassified from
	Recognized in OCI		AOCI into Net Earnings	AOCI into Net Earnings
Hot-rolled coil steel contracts	$	(14,751,900)	Costs of goods sold	$	6,414,500

Not Designated as Hedging Instrument [Member]

Notes Tables

Derivative Instruments, Gain (Loss) [Table Text Block]

		Loss Recognized in Earnings
	Location of Loss	for Fiscal Year Ended
	Recognized in Earnings	March 31, 2021
Hot-rolled coil steel contracts	Other income (loss)	$	515,160

Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]

Notes Tables

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

	Gain (Loss) on
	Derivatives
Balance at March 31, 2020	$	—
Other comprehensive loss, net of income, before reclassification		(6,323,084)
Gain reclassified from AOCI (1)		(4,864,757)
Net current period other comprehensive loss		(11,187,841)
Balance at March 31, 2021	$	(11,187,841)