Note 11 - Asset Retirement Obligations (Tables)

6 Months Ended

Jan. 31, 2021

Notes Tables

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

Balance, July 31, 2020	$	3,734,314
Accretion		102,170
Balance, January 31, 2021	$	3,836,484

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

	January 31, 2021					July 31, 2020
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 2022	$	-
Fiscal 2023		-
Fiscal 2024		-
Fiscal 2025		-
Fiscal 2026		-
Remaining balance		8,221,018
	$	8,221,018