Note 3 - Fair Value Measurements - Estimated Fair Value Assumptions (Details) - January 2022 Warrants [Member]	Mar. 31, 2023	Dec. 31, 2022
Measurement Input, Expected Term [Member]
Measurement Input	1.7	1.9
Measurement Input, Price Volatility [Member]
Measurement Input	0.709	0.499
Measurement Input, Risk Free Interest Rate [Member]
Measurement Input	0.0430	0.0448
Measurement Input, Expected Dividend Rate [Member]
Measurement Input	0.0000	0.0000
Measurement Input, Share Price [Member]
Measurement Input	2.00	1.25
Measurement Input, Exercise Price [Member]
Measurement Input	0.7949	0.7949