Note 11 - Stockholders' Equity and Common Stock Warrants - Warrants Outstanding to Acquire Shares of Its Common Stock (Details)	Dec. 31, 2024 $ / shares shares
Class of Warrant or Right, Outstanding | shares	2,609,289
Historical Diffusion Common Stock Warrants [Member]
Class of Warrant or Right, Outstanding | shares	33,386
Historical Diffusion Common Stock Warrants [Member] | Minimum [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares	$ 44.55
Historical Diffusion Common Stock Warrants [Member] | Maximum [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares	$ 98.48
Historical EIP Common Stock Warrants [Member]
Class of Warrant or Right, Outstanding | shares	43,618
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares	$ 19.81
Series A Common Stock Warrants [Member]
Class of Warrant or Right, Outstanding | shares	2,532,285
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares	$ 39.24