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Note 6 - Convertible Debentures (Details Textual) - USD ($)
12 Months Ended
Sep. 29, 2020
Jun. 26, 2020
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2020
Sep. 24, 2020
Proceeds from Convertible Debt     $ 888,500    
Number of Common Stock Securities Called by Each Unit (in shares) 1          
Amortization of Debt Discount (Premium)     124,185    
Conversion from Convertible Debentures to Conversion Units [Member]            
Debt Instrument, Convertible, Conversion Price (in dollars per share) $ 4          
Debt Conversion, Original Debt, Amount $ 1,200,000          
Debt Conversion, Accrued Interest Amount $ 14,667          
Debt Conversion, Converted Instrument, Shares Issued (in shares) 303,668          
Conversion from Convertible Debentures to Conversion Units [Member] | Conversion Units Tranche One [Member]            
Debt Conversion, Converted Instrument, Shares Issued (in shares) 177,626          
Number of Common Stock Securities Called by Each Unit (in shares) 1          
Conversion from Convertible Debentures to Conversion Units [Member] | Conversion Units Tranche Two [Member]            
Debt Conversion, Converted Instrument, Shares Issued (in shares) 126,042          
June 2020 Warrants [Member]            
Warrants and Rights Outstanding, Term (Year)   5 years        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)   120,000        
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 5 $ 10     $ 5  
Warrants and Rights Outstanding   $ 457,833        
Payments of Debt Issuance Costs   $ 161,500        
Conversion Warrant [Member]            
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) 1          
Pre-Funded Warrants [Member]            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 250,000          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 0.01       $ 0.01 $ 0.01
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) 1         1
Pre-Funded Warrants [Member] | Conversion from Convertible Debentures to Conversion Units [Member] | Conversion Units Tranche Two [Member]            
Number of Warrants Called by Each Unit (in shares) 1          
Unit Warrants [Member]            
Warrants and Rights Outstanding, Term (Year) 5 years          
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 2,560,000          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 5          
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) 1          
Conversion Warrants [Member] | Conversion from Convertible Debentures to Conversion Units [Member] | Conversion Units Tranche One [Member]            
Number of Warrants Called by Each Unit (in shares) 1          
Conversion Warrants [Member] | Conversion from Convertible Debentures to Conversion Units [Member] | Conversion Units Tranche Two [Member]            
Number of Warrants Called by Each Unit (in shares) 1          
Convertible Debentures [Member]            
Number of Institutional Investors   2        
Proceeds from Convertible Debt, Gross   $ 1,050,000        
Debt Instrument, Interest Rate, Stated Percentage   5.00%        
Debt Instrument, Face Amount   $ 1,200,000        
Proceeds from Convertible Debt   $ 888,500        
Debt Instrument, Term (Year)   1 year        
Gross Proceeds from Issuance of Common Stock, Public Offering   $ 6,000,000        
Debt Instrument, Convertible, Conversion Price (in dollars per share)   $ 10        
Percentage of Offering Price   80.00%        
Debt Instrument, Convertible, Maximum Allowed Ownership of Common Stock Outstanding, Percentage   4.99%        
Debt Instrument, Unamortized Discount, Total $ 645,150 $ 769,334        
Debt Conversion, Original Debt Discount   $ 150,000        
Interest Expense, Debt, Total     138,851      
Amortization of Debt Discount (Premium)     $ 124,185