Note 6 - Warrants - Assumptions Used to Determine Fair Value of Warrants (Details)	Mar. 31, 2023	Dec. 31, 2022
Measurement Input, Price Volatility [Member]
Risk free interest rate		0.40
Measurement Input, Expected Term [Member]
Risk free interest rate		3
Minimum [Member] | Measurement Input, Risk Free Interest Rate [Member]
Risk free interest rate	0.0388	0.0369
Minimum [Member] | Measurement Input, Price Volatility [Member]
Risk free interest rate	0.40
Maximum [Member] | Measurement Input, Risk Free Interest Rate [Member]
Risk free interest rate	0.0427	0.0388
Maximum [Member] | Measurement Input, Price Volatility [Member]
Risk free interest rate	0.95
Maximum [Member] | Measurement Input, Expected Term [Member]
Risk free interest rate	5