Note 5 - Warrants (Details Textual)	3 Months Ended		12 Months Ended
	Mar. 31, 2023 USD ($) $ / shares shares	Mar. 31, 2022 USD ($) shares	Dec. 31, 2022 shares	Sep. 30, 2022 $ / shares	Sep. 08, 2022 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) shares
Proceeds from Warrant Exercises | $	$ 19,593	$ 70
Share Price | $ / shares	$ 4.19				$ 2.20
Public Warrants [Member]
Class of Warrant or Right, Outstanding	6,325,000
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right	1					6,325,000
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares	$ 11.50
Class of Warrant or Right, Redemption Price Per Share | $ / shares	$ 0.01
Threshold Closing Price for Specified Number of Trading Days | $ / shares				$ 21.00
Threshold Trading Days for Sale of Shares (Day)	20 days
Threshold Consecutive Trading Days for Sale of Shares (Day)	30 days
Private Warrants [Member]
Class of Warrant or Right, Outstanding	3,915,997
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares	$ 11.50
Private Warrants [Member] | Measurement Input, Price Volatility [Member]
Warrants and Rights Outstanding, Measurement Input	0.7570
Private Warrants [Member] | Measurement Input, Risk Free Interest Rate [Member]
Warrants and Rights Outstanding, Measurement Input	0.0388
Investor Warrant [Member]
Class of Warrant or Right, Outstanding	6,866,901
Class of Warrant or Right, Number of Securities Called by Warrants or Rights					6,900,000
Class of Warrant or Right, Exercised During Period (in shares)	6,334	6,000
Proceeds from Warrant Exercises | $	$ 19,593	$ 18,563
Stock Issued During Period, Shares, Warrants Exercised (in shares)	4,750	4,500
Private Pre-funded Warrant [Member]
Class of Warrant or Right, Outstanding	1,383,399
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right					1,383,399
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares					$ 0.0001
Class of Warrant or Right, Exercised During Period (in shares)	0
Assumed Warrants [Member]
Class of Warrant or Right, Outstanding	120,456
Class of Warrant or Right, Number of Securities Called by Warrants or Rights						126,268
Class of Warrant or Right, Expired During Period			5,812
Warrants and Rights Outstanding | $						$ 1,279,182
Private Placement Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights					3,359,684	556,313
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares					$ 2.40
Class of Warrant or Right, Exercised During Period (in shares)	0
Pre-Funded Warrant [Member]
Class of Warrant or Right, Outstanding	0
Class of Warrant or Right, Number of Securities Called by Warrants or Rights					5,066,600
Class of Warrant or Right, Exercised During Period (in shares)	4,033,300	1,033,300
Proceeds from Warrant Exercises | $	$ 403	$ 103
Stock Issued During Period, Shares, Warrants Exercised (in shares)	4,033,300	1,033,300
Private Placement Warrants and Private Pre-funded Warrants [Member]
Warrants and Rights Outstanding | $					$ 5,712,592
Warrants and Rights Outstanding, Term					5 years
Private Placement Warrants and Private Pre-funded Warrants [Member] | Measurement Input, Price Volatility [Member]
Warrants and Rights Outstanding, Measurement Input					1.11
Private Placement Warrants and Private Pre-funded Warrants [Member] | Measurement Input, Risk Free Interest Rate [Member]
Warrants and Rights Outstanding, Measurement Input					0.034
Private Placement Warrants and Private Pre-funded Warrants [Member] | Measurement Input, Expected Dividend Rate [Member]
Warrants and Rights Outstanding, Measurement Input					0