Note 5 - Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2026

Table Text Block [Abstract]

Schedule of Stockholders' Equity warrant outstanding and exercisable.

The following table summarizes the Company's outstanding and exercisable common stock warrants as of June 30, 2026:


Common Stock Warrants		Classification		Number of Warrants Outstanding and Exercisable				Weighted Average Exercise Price				Weighted Average Remaining Contractual Life (Years)
October 2025 Offering Pre-Funded Common Stock Warrants		Equity-classified			37,814,754			$	0.0001			Perpetual			(1)
July 2025 Warrant Inducement Replacement Common Stock Warrants		Equity-classified			8,637,810				0.9047				4.43
February 2024 Warrant Inducement Replacement Common Stock Warrants		Equity-classified			113,804				10.97				2.59
Series 2 Common Stock Warrants		Equity-classified			6,748				0.70				1.12
Bridge and January 2022 Common Stock Warrants		Liability-classified			2,612				2,804.69				0.13
Placement Agent, Solicitor and Representative Common Stock Warrants		Equity-classified			5,084,891				1.70				4.19
All Other Common Stock Warrants		Equity-classified			775				11,603.25				0.95
Total Warrants Outstanding and Exercisable, June 30, 2026					51,661,394				0.66				4.32		(1)

(1) The pre-funded common stock warrants outstanding as of June 30, 2026 have a perpetual term and are therefore excluded from the calculation of the weighted-average remaining contractual life.

Schedule of Stockholders' Equity Note, Warrants or Rights

The following table summarizes all common stock warrant activity during the six months ended June 30, 2026:


		Number of Warrants				Weighted Average Exercise Price				Weighted Average Remaining Contractual Life (Years)
Warrants outstanding, December 31, 2025			64,031,148			$	0.53				4.81		(1)
Granted			—				—
Exercised			(12,369,753	)			0.0126
Forfeited, expired or cancelled			(1	)			20,692.50
Warrants outstanding, June 30, 2026			51,661,394				0.66				4.32		(1)

(1) The pre-funded common stock warrants outstanding as of June 30, 2026 have a perpetual term and are therefore excluded from the calculation of the weighted-average remaining contractual life.