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Note 9 - Long-term Debt (Details Textual)
1 Months Ended 3 Months Ended
Dec. 14, 2020
USD ($)
shares
Oct. 31, 2020
USD ($)
Oct. 31, 2019
USD ($)
Jul. 31, 2020
USD ($)
Dec. 05, 2018
Amortization of Debt Discount (Premium)   $ 443,867 $ 432,221    
Working Capital Ratio   4.7      
Long-term Debt, Gross   $ 20,000,000   $ 20,000,000  
Subsequent Event [Member]          
Stock Issued During Period, Shares, Credit Facility (in shares) | shares 1,249,039        
Stock Issued During Period, Value, Credit Facility $ 1,170,000        
Percentage of Outstanding Principal of Anniversary Fee 6.50%        
Credit Agreement [Member]          
Interest Paid, Including Capitalized Interest, Operating and Investing Activities, Total   $ 408,889 $ 408,889    
Debt Instrument, Interest Rate, Stated Percentage         8.00%
Debt Instrument, Interest Rate, Effective Percentage         16.67%
Debt Instrument, Covenant, Minimum Working Capital Ratio         1
Credit Agreement [Member] | Subsequent Event [Member]          
Repayments of Long-term Debt, Total $ 2,000,000        
Long-term Debt, Gross $ 18,000,000