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Note 8 - Convertible Notes Payable - Related Parties (Details Textual)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Aug. 12, 2021
USD ($)
Aug. 12, 2021
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Interest Expense, Related Party     $ 113,414 $ 106,059 $ 236,650 $ 211,510  
Subsequent Event [Member]              
Debt Instrument, Convertible, Number of Equity Instruments   52,631          
Convertible Debt Payable to Related Party [Member]              
Interest Payable, Related Party     1,102,743   1,102,743   $ 1,046,911
Interest Expense, Related Party     61,752 59,871 121,126 119,739  
Debt Instrument, Convertible, Beneficial Conversion Feature     18,142 $ 0 $ 18,142 $ 0  
Debt Instrument, Convertible, Number of Equity Instruments         1,587,167    
Long-term Debt, Total     $ 2,419,983   $ 2,419,983   $ 2,558,681
Convertible Debt Payable to Related Party [Member] | Subsequent Event [Member]              
Debt Instrument, Convertible, Number of Equity Instruments 1,492,679            
Debt Instrument, Debt Default, Amount $ 2,388,287 $ 2,388,287          
Convertible Debt Payable to Related Party [Member] | Joseph Byrne [Member]              
Debt Instrument, Convertible, Number of Equity Instruments         76,123   76,123
Convertible Debt Payable to Related Party Reclassified to Private Investor [Member] | Joseph Byrne [Member]              
Debt Instrument, Convertible, Number of Equity Instruments     63,997        
Long-term Debt, Total     $ 102,395   $ 102,395