Quarterly report pursuant to Section 13 or 15(d)

Note 10 - Convertible Notes (Details Textual)

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Note 10 - Convertible Notes (Details Textual) - USD ($)
3 Months Ended
Nov. 06, 2020
Jun. 22, 2020
Jun. 04, 2020
Jun. 03, 2020
Dec. 31, 2021
Dec. 31, 2020
Series D Warrants [Member]            
Proceeds from Warrant Exercises   $ 82,000   $ 850,000    
Class of Warrant or Right, Warrants Exercised (in shares)   454,546        
Remaining Warrants [Member]            
Class of Warrant or Right, Warrants Exercised (in shares)     4,727,273      
Series J Warrants [Member]            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 3,375,000 340,910 3,545,454      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)   $ 0.25 $ 0.25      
Warrants and Rights Outstanding, Term (Year) 30 months 1 year 1 year      
Series 1 Convertible Notes [Member]            
Debt Instrument, Interest Rate, Stated Percentage     10.00%      
Debt Instrument, Face Amount     $ 550,000      
Debt Instrument, Term (Year)     3 years      
Debt Instrument, Convertible, Conversion Price (in dollars per share)     $ 0.27      
Debt Instrument, Early Repayment Minimum Interest, Percentage     10.00%      
Series 1 Convertible Notes [Member] | Maximum [Member]            
Debt Instrument, Convertible, Conversion Price (in dollars per share)     $ 0.32      
Series 2 Convertible Notes [Member]            
Debt Instrument, Interest Rate, Stated Percentage 10.00%          
Debt Instrument, Face Amount $ 1,050,000          
Debt Instrument, Term (Year) 3 years          
Debt Instrument, Convertible, Conversion Price (in dollars per share) $ 0.25          
Debt Instrument, Early Repayment Minimum Interest, Percentage 10.00%          
Series 2 Convertible Notes [Member] | Maximum [Member]            
Debt Instrument, Convertible, Conversion Price (in dollars per share) $ 0.32          
Series 1 & 2 Convertible Notes [Member]            
Interest Expense, Debt, Total         $ 40,000 $ 29,000