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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		12 Months Ended
	Mar. 22, 2024	Mar. 21, 2024	Sep. 30, 2024 USD ($) shares	Sep. 30, 2023 USD ($) shares	Sep. 30, 2024 USD ($) shares	Sep. 30, 2023 USD ($) shares	Dec. 31, 2022	Dec. 31, 2023 USD ($)
Number of Operating Segments							1
Retained Earnings (Accumulated Deficit)			$ (151,485)		$ (151,485)			$ (131,604)
Cash			$ 9,400		$ 9,400
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) \| shares			4.8	0.6	2.7	0.5
General and Administrative Expense [Member]
Legal Fees			$ 100	$ 400	$ 200	$ 1,400
Reverse Stock Split [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio	15	15