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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

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