Note 2 - Basis of Presentation, Principles of Consolidation and Significant Accounting Policies (Details Textual) $ / shares in Units, $ in Thousands, shares in Millions			1 Months Ended	12 Months Ended
	Mar. 22, 2024 $ / shares	Mar. 21, 2024	Feb. 28, 2025 USD ($)	Dec. 31, 2024 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares	$ 0.001			$ 0.001	$ 0.001
Net Cash Provided by (Used in) Operating Activities				$ (23,862)	$ (23,591)
Number of Operating Segments				1
Number of Reportable Segments				1
Retained Earnings (Accumulated Deficit)				$ (153,367)	(131,604)
Cash				4,300
Legal Fees				$ 200	$ 1,500
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares				4.3	0.5
AUSTRALIA
Cash				$ 600
Subsequent Event [Member]
Cash Provided by (Used in) Financing Activities			$ 9,300
Revision of Prior Period, Adjustment [Member]
Net Cash Provided by (Used in) Operating Activities					$ 510
Reverse Stock Split [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio	15	15