Note 10 - Asset Retirement Obligations (Tables)

9 Months Ended

Apr. 30, 2019

Notes Tables

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

Balance, July 31, 2018	$	4,020,282
Accretion		172,022
Balance, April 30, 2019	$	4,192,304

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

	April 30, 2019				July 31, 2018
Undiscounted amount of estimated cash flows	$	7,275,504			$	7,275,504
Payable in years		5.0	to	17		5.0	to	17
Inflation rate		1.37%	to	2.14%		1.37%	to	2.14%
Discount rate		5.48%	to	6.40%		5.48%	to	6.40%

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

Fiscal 2019	$	-
Fiscal 2020		-
Fiscal 2021		-
Fiscal 2022		-
Fiscal 2023		148,391
Remaining balance		7,127,113
	$	7,275,504