Note 7 - Fair Value Measurements (Tables)

12 Months Ended

Mar. 31, 2021

Notes Tables

Fair Value, Liabilities Measured on Recurring Basis [Table Text Block]

	Quoted Prices
	in Active			Significant
	Markets for			Other		Significant
	Identical			Observable		Unobservable
	Assets			Inputs		Inputs
	(Level 1)			(Level 2)		(Level 3)		Total
Commodity futures – financial liabilities, net	$	(7,407,400	)	$	—	$	—	$	(7,407,400	)
Total	$	(7,407,400	)	$	—	$	—	$	(7,407,400	)

Fair Value Measurements, Nonrecurring [Table Text Block]

	Quoted Prices
	in Active		Significant
	Markets for		Other		Significant
	Identical		Observable		Unobservable
	Assets		Inputs		Inputs
	(Level 1)		(Level 2)		(Level 3)		Total
Long-lived assets held and used (1)	$	—	$	—	$	1,771,450	$	1,771,450
Total	$	—	$	—	$	1,771,450	$	1,771,450