Note 6 - Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2025

Notes Tables

Fair Value, Liabilities Measured on Recurring Basis [Table Text Block]

	Fair Value Measurements at September 30, 2025
	Quoted Prices in		Other		Significant
	Active Markets for		Observable		Unobservable
	Identical Assets		Inputs		Inputs
	(Level 1)		(Level 2)		(Level 3)		Total
Derivative liabilities -Series A warrants	$	—	$	—	$	123,000	$	123,000
Total	$	—	$	—	$	123,000	$	123,000

	Fair Value Measurements at December 31, 2024
	Quoted Prices in		Other		Significant
	Active Markets for		Observable		Unobservable
	Identical Assets		Inputs		Inputs
	(Level 1)		(Level 2)		(Level 3)		Total
Derivative liabilities -Series A and B warrants	$	—	$	—	$	16,400,000	$	16,400,000
Total	$	—	$	—	$	16,400,000	$	16,400,000

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

	September 30, 2025			December 31, 2024
Exercise price	$	—		$	1.9445
Stock price	$	2.01		$	3.47
Expected term		4.00			4.75
Volatility		137.15	%		133.00	%
Risk-free rate		3.74	%		4.28	%
Dividend yield		0.00	%		0.00	%
Probability of capital raise below exercise price		0.00	%		100	%

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

	Amount
Balance as of December 31, 2024	$	16,400,000
Amended Series B warrants reclassified to stockholders' equity		(7,766,000	)
Change in fair value of warrant liabilities		(8,511,000	)
Balance as of September 30, 2025	$	123,000