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Note 9 - Long-term Debt (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2020
Jan. 31, 2019
Oct. 31, 2019
Jul. 31, 2019
Amortization of Debt Discount (Premium) $ 412,580 $ 358,349 $ 844,801 $ 666,120    
Stock Issued During Period, Shares, Credit Facility 1,743,462          
Stock Issued During Period, Value ,Credit Facility $ 1,400,000 $ 1,400,000        
Percentage of Outstanding Principal of Anniversary Fee 7.00%          
Long-term Debt, Gross $ 20,000,000   $ 20,000,000     $ 20,000,000
Credit Agreement [Member]            
Long-term Debt, Gross         $ 20,000,000  
Debt Instrument, Interest Rate, Stated Percentage 8.00%   8.00%      
Debt Instrument, Interest Rate, Effective Percentage 16.67%   16.67%