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Note 9 - Long-term Debt (Details Textual) - USD ($)
1 Months Ended 3 Months Ended
Dec. 09, 2019
Oct. 31, 2019
Oct. 31, 2018
Jul. 31, 2019
Amortization of Debt Discount (Premium)   $ 432,221 $ 307,771  
Debt Instrument, Interest Rate, Stated Percentage   8.00%    
Debt Instrument, Interest Rate, Effective Percentage   16.67%    
Long-term Debt, Gross   $ 20,000,000   $ 20,000,000
Credit Agreement [Member]        
Long-term Debt, Gross   $ 20,000,000    
Subsequent Event [Member]        
Stock Issued During Period, Shares, Credit Facility 1,743,462      
Stock Issued During Period, Value ,Credit Facility $ 1,400,000      
Percentage of Outstanding Principal of Anniversary Fee 7.00%