Note 10 - Asset Retirement Obligations (Tables)

3 Months Ended

Oct. 31, 2019

Notes Tables

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

Balance, July 31, 2019	$	3,541,082
Accretion		48,308
Balance, October 31, 2019	$	3,589,390

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

	October 31, 2019					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