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Note 12 - Lease Liabilities (Details Textual) - USD ($)
12 Months Ended
Jul. 31, 2021
Jul. 31, 2020
Operating Lease, Weighted Average Remaining Lease Term (Year) 17 years 15 years 146 days
Operating Lease, Weighted Average Discount Rate, Percent 4.74% 4.70%
Operating Lease, Payments $ 252,237 $ 176,425
Minimum [Member]    
Lessee, Operating Lease, Remaining Lease Term (Year) 255 days  
Maximum [Member]    
Lessee, Operating Lease, Remaining Lease Term (Year) 17 years 292 days