Note 1 - Organization and Nature of Business (Details Textual) $ / shares in Units, $ in Thousands	1 Months Ended			3 Months Ended
	Mar. 31, 2025 USD ($) shares	Jun. 30, 2024 USD ($) $ / shares shares	Jan. 31, 2024 USD ($) $ / shares shares	Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)
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%
Stock Issued During Period, Shares, New Issues (in shares) | shares	0
June 2024 Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares		50,000,000
Shares Issued, Price Per Share (in dollars per share) | $ / shares		$ 0.8
Proceeds from Issuance or Sale of Equity		$ 40,000
Proceeds from Issuance of Common Stock		$ 37,500
RA Capital Healthcare Fund 2024 [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares			15,384,615
Shares Issued, Price Per Share (in dollars per share) | $ / shares			$ 0.65
Proceeds from Issuance of Common Stock			$ 9,900	$ 0	$ 9,945
Gross Proceeds from Issuance of Common Stock			$ 10,000