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Note 5 - Notes Payable (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Mar. 01, 2021
Mar. 31, 2021
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Repayments of Debt       $ 4,162,744 $ 1,459,973
Debt Issued in September 2018, September, 2019, and February 2020 [Member]          
Repayments of Debt $ 5,906,802        
Conversion of 2018 Investor Loan into Common Stock [Member]          
Debt Conversion, Original Debt, Amount     $ 267,328    
Debt Conversion, Converted Instrument, Shares Issued (in shares)     170,000    
Conversion of 2019 and 2020 Investor Promissory Notes into Common Stock [Member]          
Debt Conversion, Original Debt, Amount   $ 514,011      
Debt Conversion, Converted Instrument, Shares Issued (in shares)   1,107,544