Note 1 - Organization and Nature of Business (Details Textual) $ / shares in Units, $ in Thousands	1 Months Ended			3 Months Ended	4 Months Ended	9 Months Ended
	Mar. 31, 2025	Jun. 30, 2024 USD ($) $ / shares shares	Jan. 31, 2024 USD ($) $ / shares shares	Sep. 30, 2025 USD ($) shares	Sep. 30, 2024 USD ($) $ / shares shares	Sep. 30, 2025 USD ($) shares	Sep. 30, 2024 USD ($) $ / shares
Number of Reportable Segments						1
The March 2025 ATM [Member]
Open Market Sale Agreement, Maximum Aggregate Offering Price						$ 50,000
Open Market Sale Agreement, Sales Commission, Percentage	3.00%					3.00%
Stock Issued During Period, Shares, New Issues (in shares) | shares				382,700		382,700
Proceeds from Issuance or Sale of Equity						$ 200
Proceeds from Issuance of Common Stock				$ 100		100
Gross Proceeds from Issuance of Common Stock				$ 200		200
June 2024 Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares		50,000,000			50,000,000
Proceeds from Issuance or Sale of Equity					$ 40,000
Proceeds from Issuance of Common Stock		$ 37,500			$ 37,500	0	$ 37,545
Shares Issued, Price Per Share (in dollars per share) | $ / shares		$ 0.8			$ 0.8		$ 0.8
RA Capital Healthcare Fund 2024 [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares			15,384,615
Proceeds from Issuance of Common Stock			$ 9,900			$ 0	$ 9,945
Shares Issued, Price Per Share (in dollars per share) | $ / shares			$ 0.65
Gross Proceeds from Issuance of Common Stock			$ 10,000