Note 3 - Fair Value Measurements - Estimated Fair Value Assumptions (Details) - January 2022 Warrants [Member]	Jun. 30, 2023	Dec. 31, 2022
Measurement Input, Expected Term [Member]
Measurement Input	1.4	1.9
Measurement Input, Price Volatility [Member]
Measurement Input	0.829	0.499
Measurement Input, Risk Free Interest Rate [Member]
Measurement Input	0.0514	0.0448
Measurement Input, Expected Dividend Rate [Member]
Measurement Input	0.0000	0.0000
Measurement Input, Share Price [Member]
Measurement Input	1.26	1.25
Measurement Input, Exercise Price [Member]
Measurement Input	0.7949	0.7949