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Note 6 - Long-term Debt (Details Textual)			3 Months Ended
	Mar. 01, 2022 USD ($)	Apr. 08, 2021 USD ($) $ / shares shares	Mar. 31, 2022 USD ($) $ / shares	Mar. 31, 2021 USD ($)	Dec. 31, 2021 $ / shares
Stock Issued During Period, Shares, Issued for Commitment Fee (in shares) | shares		80,000
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares		$ 0.001	$ 0.001		$ 0.001
Repayments of Convertible Debt			$ 840,000	$ (0)
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, Interest Rate, Stated Percentage		5.00%
Debt Conversion, Percent of Common Stock Price Value		175.00%
Debt Instrument, Periodic Payment, Principal	$ 840,000
Debt Instrument, Redemption Covenant, Floor Price (in dollars per share) | $ / shares		$ 1.75
Repayments of Convertible Debt			840,000
Interest Expense, Debt, Total			187,500	0
Amortization of Debt Issuance Costs			$ 297,338	$ 0

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Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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