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Note 5 - Long-term Debt (Details Textual)
3 Months Ended 6 Months Ended
Mar. 01, 2022
USD ($)
Apr. 09, 2021
shares
Apr. 08, 2021
USD ($)
$ / shares
shares
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Stock Issued During Period, Shares, Issued for Commitment Fee (in shares) | shares   80,000 80,000        
Convertible Debt [Member]              
Debt Instrument, Face Amount     $ 15,000,000.0        
Debt Instrument, Redemption Price, Percentage     112.00%        
Debt Instrument, Convertible, Conversion Ratio     0.1006749        
Debt Instrument, Redemption Covenant, Floor Price (in dollars per share) | $ / shares     $ 1.75        
Debt Instrument, Interest Rate, Stated Percentage       5.00%   5.00%  
Interest Expense, Debt, Total       $ 422,638 $ 0 $ 422,638 $ 0
Amortization of Debt Issuance Costs       $ 251,804 $ 0 $ 251,804 $ 0
Convertible Debt [Member] | Forecast [Member]              
Debt Instrument, Periodic Payment, Principal $ 840,000