Note 8 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended			3 Months Ended	4 Months Ended	9 Months Ended
	Mar. 31, 2025	Jun. 30, 2024	Jan. 31, 2024	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Preferred Stock, Shares Authorized (in shares)				5,000,000		5,000,000		5,000,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share)				$ 0.0001		$ 0.0001		$ 0.0001
Preferred Stock, Shares Outstanding, Ending Balance (in shares)				0		0		0
Common Stock, Shares Authorized (in shares)				350,000,000		350,000,000
Common Stock, Par or Stated Value Per Share (in dollars per share)				$ 0.0001		$ 0.0001		$ 0.0001
Dividends						$ 0
March 2025 ATM with Citizens and B. Riley [Member]
Equity Offering, Maximum Amount	$ 50,000
The March 2025 ATM [Member]
Open Market Sale Agreement, Sales Commission, Percentage	3.00%					3.00%
Stock Issued During Period, Shares, New Issues (in shares)				382,700		382,700
Gross Proceeds from Issuance of Common Stock				$ 200		$ 200
Proceeds from Issuance of Common Stock				$ 100		100
Stock Issued During Period, Value, New Issues						53
June 2024 Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares)		50,000,000			50,000,000
Proceeds from Issuance of Common Stock		$ 37,500			$ 37,500	0	$ 37,545
Shares Issued, Price Per Share (in dollars per share)		$ 0.8			$ 0.8		$ 0.8
Stock Issued During Period, Value, New Issues		$ 40,000					$ 37,545
RA Capital Healthcare Fund 2024 [Member]
Stock Issued During Period, Shares, New Issues (in shares)			15,384,615
Gross Proceeds from Issuance of Common Stock			$ 10,000
Proceeds from Issuance of Common Stock			$ 9,900			$ 0	9,945
Shares Issued, Price Per Share (in dollars per share)			$ 0.65
Stock Issued During Period, Value, New Issues							$ 9,945