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Note 1 - Description of Business (Details Textual) $ / shares in Units, $ in Thousands			1 Months Ended	3 Months Ended	12 Months Ended
	Nov. 07, 2024 USD ($) $ / shares shares	Nov. 22, 2022 USD ($)	Nov. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2027 USD ($)	Dec. 31, 2026 USD ($)	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Nov. 01, 2024 USD ($)	Oct. 31, 2024 USD ($)
Operating Income (Loss)								$ (18,845)	$ (17,259)
Net Cash Provided by (Used in) Operating Activities								(18,047)	(5,249)
Cash and Cash Equivalents, at Carrying Value				$ 31,741				31,741	43,652
Percentage of Workforce			25.00%
Savings From Reduction in Workforce			$ 4,300
Restructuring Charges				$ 600
Number of Directors										5	8
Board of Directors, Annual Cash Compensation, Liability										$ 100	$ 500
Authorized Value Of Securities Registered and Sold		$ 100,000
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration]				Nonoperating Income (Expense)
Prefunded Warrants [Member]
Class of Warrant or Right, Outstanding (in shares) \| shares	2,934,690
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) \| $ / shares	$ 0.001
Line of Credit [Member] \| Perceptive Credit Agreement [Member]
Debt Instrument, Covenant, Twelve Month Net Revenue Target, Year One								34,400
Debt Instrument, Minimum Cash Balance	$ 3,000
Line of Credit [Member] \| Perceptive Credit Agreement [Member] \| Forecast [Member]
Debt Instrument, Covenant, Twelve Month Net Revenue Target, Year Two							$ 37,000
Debt Instrument, Covenant, Twelve Month Net Revenue Target, Year Three						$ 52,400
Debt Instrument, Covenant, Twelve Month Net Revenue Target, Year Four					$ 60,300
Debt Instrument, Maximum Operating Expense Covenant						$ 45,000	$ 40,000
ATM Facility [Member]
Authorized Value Of Securities Registered and Sold		$ 40,000
Registered Direct Offering [Member]
Proceeds from Issuance or Sale of Equity	$ 6,800							$ 7,000	$ 0
Stock Issued During Period, Shares, New Issues (in shares) \| shares	3,000,000