Note 4 - Warrants and Equity (Tables)

9 Months Ended

Sep. 30, 2025

Notes Tables

Schedule of Warrants or Rights, Assumptions Used [Table Text Block]

	September 30, 2025
Risk-free interest rate		3.7% to 3.7%
Volatility		111.1% to 112.7%
Expected life (years)		4.9 to 5.0
Dividend yield		—%

Schedule of Warrant Activity [Table Text Block]

	Number of Shares			Range of Warrant Exercise				Weighted Average		Weighted Average Remaining Contractual
	Under Warrant			Price per Share				Exercise Price		Life (Years)
Balance at January 1, 2025		—		$	—	$	—	$	—		—
Granted		113,104,864		$	0.37	$	0.55	$	0.47		—
Exercised		(19,212,408	)	$	0.37	$	0.37	$	0.37		—
Balance at September 30, 2025		93,892,456		$	0.37	$	0.55	$	0.49		5.0
Exercisable at September 30, 2025		93,892,456		$	0.37	$	0.55	$	0.49		5.0

	Number of Shares			Range of Warrant Exercise
	Under Warrant			Price per Share
Balance at January 1, 2025		7,810,033		$	—	$	—
Granted		19,966,089		$	0.43	$	1.64
Exercised		(7,477,570	)	$	0.00	$	2.23
Expired warrants		(67,670	)	$	94.50	$	94.50
Balance at September 30, 2025		20,230,882		$	0.00	$	0.55
Exercisable at September 30, 2025		18,976,140		$	0.75	$	54.45