Note 5 - Warrants - Assumptions Used (Details)	Dec. 31, 2022	Dec. 31, 2021
Minimum [Member] | Measurement Input, Risk Free Interest Rate [Member]
Warrants, assumptions	0.042	0.001
Minimum [Member] | Measurement Input, Price Volatility [Member]
Warrants, assumptions	0.631	0.718
Minimum [Member] | Measurement Input, Expected Term [Member]
Warrants, assumptions	0.1	0.1
Maximum [Member] | Measurement Input, Risk Free Interest Rate [Member]
Warrants, assumptions	0.048	0.011
Maximum [Member] | Measurement Input, Price Volatility [Member]
Warrants, assumptions	0.763	1.145
Maximum [Member] | Measurement Input, Expected Term [Member]
Warrants, assumptions	2.6	3.6