Note 2 - Basis of Presentation, Principles of Consolidation, and Significant Accounting Policies and Liquidity (Details Textual) $ in Thousands, shares in Millions		3 Months Ended		9 Months Ended
	Mar. 22, 2024	Sep. 30, 2025 USD ($) shares	Sep. 30, 2024 USD ($) shares	Sep. 30, 2025 USD ($) shares	Sep. 30, 2024 USD ($) shares	Jun. 30, 2025 USD ($)	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Jan. 01, 2024 USD ($)
Number of Operating Segments				1
Number of Reportable Segments				1
Retained Earnings (Accumulated Deficit)		$ (221,556)		$ (221,556)		$ (196,157)	$ (178,348)	$ (172,444)	$ (146,400)
Cash		6,700		6,700
General and Administrative Expense		$ 2,147	$ 2,172	$ 6,715	$ 6,629
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares		85.7	4.8	41.7	2.7
Previously Reported [Member]
Retained Earnings (Accumulated Deficit)		$ (196,589)		$ (196,589)		$ (167,443)	$ (159,803)	$ (153,367)	$ (131,600)
SEC Investigation [Member]
General and Administrative Expense			$ 100		$ 200
Reverse Stock Split [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio	15