Note 6 - Stockholders' Equity and Dilutive Equity Instruments (Details Textual)	Mar. 31, 2023 $ / shares shares
Out-of-the-money Warrants [Member]
Class of Warrant or Right, Outstanding (in shares) | shares	5,923,399
Series A Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 57.06
Series B Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	62.28
GLF Equity Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 100.00