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Note 9 - Stockholders' Equity and Common Stock Warrants - Warrants Outstanding to Acquire Shares of Its Common Stock (Details) | Mar. 31, 2025 $ / shares shares
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Warrants outstanding (in shares) | shares | 2,609,289
Historical Diffusion Common Stock Warrants [Member] |
Warrants outstanding (in shares) | shares | 33,386
Historical Diffusion Common Stock Warrants [Member] | Minimum [Member] |
Warrants, exercise price (in dollars per share) | $ / shares | $ 44.55
Warrants, maturity date | May 01, 2025
Historical Diffusion Common Stock Warrants [Member] | Maximum [Member] |
Warrants, exercise price (in dollars per share) | $ / shares | $ 98.48
Warrants, maturity date | Feb. 28, 2026
Historical EIP Common Stock Warrants [Member] |
Warrants outstanding (in shares) | shares | 43,618
Warrants, exercise price (in dollars per share) | $ / shares | $ 19.81
Warrants, maturity date | Apr. 30, 2028
Series A Common Stock Warrants [Member] |
Warrants outstanding (in shares) | shares | 2,532,285
Warrants, exercise price (in dollars per share) | $ / shares | $ 39.24
Warrants, maturity date | Apr. 30, 2027

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