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Note 6 - Convertible Debentures (Details Textual)
9 Months Ended 12 Months Ended
Sep. 29, 2020
USD ($)
$ / shares
shares
Jun. 26, 2020
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
$ / shares
Dec. 31, 2019
USD ($)
Sep. 24, 2020
$ / shares
shares
Proceeds from Convertible Debt     $ 0 $ 888,500 $ 888,500 $ 0  
Number of Common Stock Securities Called by Each Unit (in shares) | shares 1            
Amortization of Debt Discount (Premium)     $ 0 $ 124,185 $ 124,185 $ 0  
Conversion from Convertible Debentures to Conversion Units [Member]              
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares $ 4.00            
Debt Conversion, Original Debt, Amount $ 1,200,000            
Debt Conversion, Accrued Interest Amount $ 14,667            
Debt Conversion, Converted Instrument, Shares Issued (in shares) | shares 303,668            
Conversion from Convertible Debentures to Conversion Units [Member] | Conversion Units Tranche One [Member]              
Debt Conversion, Converted Instrument, Shares Issued (in shares) | shares 177,626            
Number of Common Stock Securities Called by Each Unit (in shares) | shares 1            
Conversion from Convertible Debentures to Conversion Units [Member] | Conversion Units Tranche Two [Member]              
Debt Conversion, Converted Instrument, Shares Issued (in shares) | 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) | shares   120,000          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares $ 5.00 $ 10.00     $ 5.00    
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) | shares 1            
Pre-Funded Warrants [Member]              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares 250,000            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares $ 0.01       $ 0.01   $ 0.01
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) | 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) | 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) | shares 2,560,000            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares $ 5.00            
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) | 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)   12 months          
Gross Proceeds from Issuance of Common Stock, Public Offering   $ 6,000,000          
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares   $ 10.00          
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