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Note 7 - Convertible Notes (Details Textual)
1 Months Ended 3 Months Ended 6 Months Ended
Aug. 12, 2021
USD ($)
Aug. 12, 2021
USD ($)
Jun. 30, 2021
USD ($)
shares
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Subsequent Event [Member]            
Debt Instrument, Convertible, Number of Equity Instruments   52,631        
Conversion of Convertible Notes into Common Stock [Member]            
Debt Conversion, Original Debt, Amount     $ 4,855,861      
Debt Conversion, Converted Instrument, Shares Issued (in shares) | shares     3,290,180      
Debt Conversion, Accrued Interest, Amount     $ 78,893      
Stock Issued During Period, Shares, Settlement of Accrued Interest (in shares) | shares     94,357      
Convertible Debt Payable to Non-related Party [Member]            
Debt Instrument, Convertible, Beneficial Conversion Feature     $ 93,164   $ 93,164  
Convertible Debt [Member]            
Debt Instrument, Convertible, Beneficial Conversion Feature       $ 0 $ 111,306 $ 0
Debt Instrument, Convertible, Number of Equity Instruments         1,204,177  
Convertible Debt [Member] | Subsequent Event [Member]            
Debt Instrument, Convertible, Number of Equity Instruments 619,167          
Debt Instrument, Debt Default, Amount $ 985,111 $ 985,111