Note 11 - Asset Retirement Obligations (Tables)

12 Months Ended

Jul. 31, 2020

Notes Tables

Schedule of Change in Asset Retirement Obligation [Table Text Block]

Balance, July 31, 2019	$	3,541,082
Accretion		193,232
Balance, July 31, 2020	$	3,734,314

Schedule Of Estimated Cash flow and Assumption Used For ARO [Table Text Block]

	July 31, 2020				July 31, 2019
Undiscounted amount of estimated cash flows	$	8,221,018			$	8,221,018
Payable in years		9	to	21		9	to	21
Inflation rate		1.56%	to	2.17%		1.56%	to	2.17%
Discount rate		5.50%	to	5.96%		5.50%	to	5.96%

Schedule Of Undiscounted Amounts Of Estimated Cash Flows [Table Text Block]

Fiscal 2021	$	-
Fiscal 2022		-
Fiscal 2023		-
Fiscal 2024		-
Fiscal 2025		-
Remaining balance		8,221,018
	$	8,221,018