Note 3 - Warrants - Assumptions Used (Details)	Mar. 31, 2023	Dec. 31, 2022
Minimum [Member] | Measurement Input, Risk Free Interest Rate [Member]
Warrants, assumptions	0.040	0.042
Minimum [Member] | Measurement Input, Price Volatility [Member]
Warrants, assumptions	0.584	0.631
Minimum [Member] | Measurement Input, Expected Term [Member]
Warrants, assumptions	0.1	0.1
Maximum [Member] | Measurement Input, Risk Free Interest Rate [Member]
Warrants, assumptions	0.049	0.048
Maximum [Member] | Measurement Input, Price Volatility [Member]
Warrants, assumptions	0.676	0.763
Maximum [Member] | Measurement Input, Expected Term [Member]
Warrants, assumptions	2.4	2.6