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Note 8 - Convertible Note Payable (Details Textual)	Mar. 01, 2022 USD ($)	Apr. 09, 2021 shares	Mar. 24, 2021 USD ($) $ / shares shares	Dec. 31, 2021
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			100.6749
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger			175.00%
Debt Instrument, Convertible, Threshold Consecutive Trading Days			12
Debt Instrument, Redemption Covenant, Floor Price (in dollars per share) | $ / shares			$ 1.75
Debt Instrument, Interest Rate, Stated Percentage				5.00%
Convertible Debt [Member] | Forecast [Member]
Debt Instrument, Periodic Payment, Principal	$ 840,000
Debt Instrument, Convertible, Threshold Trading Days	10

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