XML 26 R52.htm IDEA: XBRL DOCUMENT v3.20.1
Note 10 - Asset Retirement Obligations - Undiscounted Amounts of Estimated Cash Flows for the Next Five Fiscal Years and Beyond (Details) - USD ($)
Jan. 31, 2020
Jul. 31, 2019
Fiscal 2021  
Fiscal 2022  
Fiscal 2023  
Fiscal 2024  
Fiscal 2025  
Remaining balance 8,221,018  
$ 8,221,018 $ 8,221,018