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Note 2 - Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2025

Notes Tables

Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]

Exercise price per warrant		$	33.00
Conversion rate - common shares per warrant			1.50
Closing price of common stock		$	23.72
Volatility			75	%
Risk-free interest rate			5.40	%
Expected life of option (in years)			0.3
Dividend yield		zero

Schedule of Segment Reporting Information, by Segment [Table Text Block]

		Three months ended								Nine months ended
		September 30,								September 30,
		2025				2024				2025				2024
Operating expenses
Research and development		$	(3,955	)		$	(17,676	)		$	(22,737	)		$	(49,107	)
General and administrative			(7,905	)			(12,947	)			(59,101	)			(62,852	)
Other segment items(a)			1,053				2,680				3,404				115,214
Net income (loss)		$	(10,807	)		$	(27,943	)		$	(78,434	)		$	3,255

		September 30, 2025				December 31, 2024
Cash and cash equivalents		$	106,080			$	128,574

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

		Three months ended								Nine months ended
		September 30,								September 30,
		2025				2024				2025				2024
Numerator, basic:
Net income (loss)		$	(10,807	)		$	(27,943	)		$	(78,434	)		$	3,255
Denominator, basic:
Weighted average common shares outstanding			48,308				47,976				48,293				45,734
Net income (loss) per share, basic		$	(0.22	)		$	(0.58	)		$	(1.62	)		$	0.07
Numerator, diluted:
Net income (loss)		$	(10,807	)		$	(27,943	)		$	(78,434	)		$	3,255
Adjustment for change in fair value of warrant liabilities			—				—				—				(43,793	)
Adjusted numerator, diluted		$	(10,807	)		$	(27,943	)		$	(78,434	)		$	(40,538	)
Denominator, diluted:
Weighted average common shares outstanding			48,308				47,976				48,293				45,734
Dilutive effect of common stock warrants			—				—				—				367
Weighted average dilutive common shares			48,308				47,976				48,293				46,101
Net loss per share, diluted		$	(0.22	)		$	(0.58	)		$	(1.62	)		$	(0.88	)
Dilutive common stock options excluded from net income (loss) per share, diluted			4,101				2,949				3,975				2,772
Dilutive Performance Awards excluded from net income (loss) per share, diluted			7				7				7				7

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Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis.

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