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Note 19 - Commitments and Contingencies (Tables)
12 Months Ended
Jul. 31, 2019
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Fiscal 2020
  $
242,408
 
Fiscal 2021
   
178,956
 
Fiscal 2022
   
-
 
Fiscal 2023
   
-
 
    $
421,364