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Note 11 - Asset Retirement Obligations (Tables)
 12 Months Ended
Jul. 31, 2019
Notes Tables  
Schedule of Change in Asset Retirement Obligation [Table Text Block]
Balance, July 31, 2018
   $
4,020,282
  
Accretion
    
229,362
  
Revision in estimate of asset retirement obligations
    
(708,562
 )
Balance, July 31, 2019
  
$
3,541,082
  
Schedule Of Estimated Cash flow and Assumption Used For ARO [Table Text Block]
   
July 31, 2019
    
July 31, 2018
  
Undiscounted amount of estimated cash flows
  
 
$
8,221,018
    
 
$
7,275,504
  
                     
Payable in years
  
 9
to
21
    
 5
to
17
  
Inflation rate
  
 1.56%
to
2.17%
    
 1.37%
to
2.14%
  
Discount rate
  
 5.50%
to
5.96%
    
 5.48%
to
6.40%
  
Schedule Of Undiscounted Amounts Of Estimated Cash Flows [Table Text Block]
Fiscal 2020
   $
-
  
Fiscal 2021
    
-
  
Fiscal 2022
    
-
  
Fiscal 2023
    
-
  
Fiscal 2024
    
-
  
Remaining balance
    
8,221,018
  
    $
8,221,018