Note 5 - Warrant Liabilities (Tables)

6 Months Ended

Jun. 30, 2025

Notes Tables

Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]

Notes Warrants	June 30, 2025			December 31, 2024
Common stock market price	$	0.86		$	1.31
Risk-free interest rate		3.9	%		4.2	%
Expected dividend yield		—			—
Expected term (in years)		2.12			2.61
Expected volatility		117.3	%		105.9	%

Additional Warrants	June 30, 2025			December 31, 2024
Common stock market price	$	0.86		$	1.31
Risk-free interest rate		3.9	%		4.3	%
Expected dividend yield		—			—
Expected term (in years)		2.62			3.12
Expected volatility		112.7	%		99.6	%