Note 3 - Financial Instruments - Fair Value Assumptions (Details)	Sep. 30, 2023	Dec. 31, 2022
Measurement Input, Price Volatility [Member]
Warrants, measurement input	1	0
Measurement Input, Risk Free Interest Rate [Member]
Warrants, measurement input	0.0449	0
Measurement Input, Expected Dividend Rate [Member]
Warrants, measurement input	0	0
Measurement Input, Expected Term [Member]
Warrants, measurement input	4.75	0
Measurement Input, Exercise Price [Member]
Warrants, measurement input	1.45	0