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Note 11 - Asset Retirement Obligations (Tables)
 12 Months Ended
Jul. 31, 2021
Notes Tables  
Schedule of Change in Asset Retirement Obligation [Table Text Block]
Balance, July 31, 2020
   $
3,734,314
  
Accretion
    
204,341
  
Balance, July 31, 2021
  
$
3,938,655
  
Schedule Of Estimated Cash flow and Assumption Used For ARO [Table Text Block]
   
July 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