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Note 9 - Equity (Details Textual)
12 Months Ended
Aug. 27, 2019
$ / shares
shares
Aug. 18, 2017
shares
Jul. 14, 2016
$ / shares
shares
Sep. 30, 2020
USD ($)
$ / shares
shares
Sep. 30, 2019
USD ($)
$ / shares
shares
Aug. 02, 2019
USD ($)
$ / shares
shares
Sep. 30, 2018
$ / shares
Dec. 12, 2017
USD ($)
May 01, 2016
USD ($)
Feb. 01, 2016
USD ($)
Sep. 30, 2010
$ / shares
shares
Preferred Stock, Shares Authorized (in shares) | shares       20,000,000 20,000,000            
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares       $ 0.0001 $ 0.0001            
Preferred Stock, Shares Outstanding, Ending Balance (in shares) | shares       0 0            
Proceeds from Issuance of Common Stock       $ 1,211,000            
Debt Conversion, Original Debt, Amount         $ 261,513            
Debt Conversion, Converted Instrument, Shares Issued (in shares) | shares         174,342            
Stock Issued During Period, Shares, Issued for Services (in shares) | shares       191,490 119,734            
Stock Issued During Period, Value, Issued for Services       $ 90,000 $ 154,998            
Stock Issued During Period, Shares, Warrants Exercised (in shares) | shares         388,000            
Proceeds from Warrant Exercises         $ 475,500            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) | shares       1,000,000 900,000            
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) | $ / shares       $ 2.25 $ 1.50            
Class of Warrant or Right, Granted During Period, Exercise Price (in dollars per share) | $ / shares         1.33            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares       $ 1.39 $ 1.52   $ 1.55        
Warrants Issued to Unrelated Party for Financing [Member]                      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares           48,000          
Warrants Issued to Unrelated Parties Lenders [Member]                      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares           600,000         1,500,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares           $ 1.50          
Warrants Issued for Notes Amendment [Member]                      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares         1,500,000            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares         $ 1.25           $ 1.25
Strategic Capital Partners [Member]                      
Debt Conversion, Converted Instrument, Shares Issued (in shares) | shares     400,000                
Strategic Capital Partners [Member] | Warrants to Purchase Additional Shares [Member]                      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares     800,000   600,000            
Class of Warrant or Right, Granted During Period, Exercise Price (in dollars per share) | $ / shares         $ 1.50            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares     $ 3                
Strategic Capital Partners [Member] | Warrants to Purchase Additional Shares [Member] | Measurement Input, Expected Dividend Rate [Member]                      
Warrants and Rights Outstanding, Measurement Input         0            
Minimum [Member] | Strategic Capital Partners [Member] | Warrants to Purchase Additional Shares [Member] | Measurement Input, Price Volatility [Member]                      
Warrants and Rights Outstanding, Measurement Input         119            
Minimum [Member] | Strategic Capital Partners [Member] | Warrants to Purchase Additional Shares [Member] | Measurement Input, Risk Free Interest Rate [Member]                      
Warrants and Rights Outstanding, Measurement Input         1.56            
Minimum [Member] | Strategic Capital Partners [Member] | Warrants to Purchase Additional Shares [Member] | Measurement Input, Share Price [Member]                      
Warrants and Rights Outstanding, Measurement Input         0.95            
Maximum [Member] | Strategic Capital Partners [Member] | Warrants to Purchase Additional Shares [Member] | Measurement Input, Expected Term [Member]                      
Warrants and Rights Outstanding, Measurement Input         5            
Maximum [Member] | Strategic Capital Partners [Member] | Warrants to Purchase Additional Shares [Member] | Measurement Input, Price Volatility [Member]                      
Warrants and Rights Outstanding, Measurement Input         144            
Maximum [Member] | Strategic Capital Partners [Member] | Warrants to Purchase Additional Shares [Member] | Measurement Input, Risk Free Interest Rate [Member]                      
Warrants and Rights Outstanding, Measurement Input         1.67            
Maximum [Member] | Strategic Capital Partners [Member] | Warrants to Purchase Additional Shares [Member] | Measurement Input, Share Price [Member]                      
Warrants and Rights Outstanding, Measurement Input         1.23            
Stock Incentive Plan [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) | shares   1,500,000                  
Share-based Payment Arrangement, Expense, after Tax       $ 471,971 $ 578,790            
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total       0              
Proceeds from Stock Options Exercised       $ 0              
Stock Incentive Plan [Member] | Consultants [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) | shares       500,000 600,000            
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) | $ / shares       $ 1.50 $ 1.50            
Share-based Payment Arrangement, Expense, after Tax         $ 488,793            
Stock Incentive Plan [Member] | Executive Officer [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) | shares 300,000     500,000              
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 1.50     $ 3              
Share-based Payment Arrangement, Expense, after Tax       $ 301,770              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 2 years 182 days                    
Stock Incentive Plan [Member] | Share-based Payment Arrangement, Option [Member] | Minimum [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate   0.28%                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year)   4 years 292 days                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate   118.00%                  
Stock Incentive Plan [Member] | Share-based Payment Arrangement, Option [Member] | Maximum [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate   1.55%                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year)   5 years                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate   142.00%                  
Equity Line Agreement [Member]                      
Purchase Price of Weighted Average Price of Common Stock               90.00%      
Stock Issued During Period, Value, New Issues         715,981            
Proceeds from Issuance of Common Stock         $ 1,211,000            
Mountain States Capital, LLC [Member]                      
Line of Credit Facility, Maximum Borrowing Capacity               $ 10,000,000      
Line of Credit Facility, Current Borrowing Capacity               $ 500,000      
Unrelated Party [Member]                      
Line of Credit Facility, Current Borrowing Capacity                 $ 1,000,000 $ 200,000  
Debt Instrument, Face Amount           $ 4,000,000