Note 2 - Basis of Presentation, Principles of Consolidation, and Significant Accounting Policies and Liquidity - Change in Accounting Policy (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						6 Months Ended		9 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2025	Jun. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024	Jan. 01, 2024	Dec. 31, 2023
Warrant liability - long-term	$ 41,333	$ 16,973	$ 0				$ 16,973		$ 41,333		$ 0
Total liabilities	47,273	25,178	7,222				25,178		47,273		5,717
Additional paid-in capital	194,631	192,580	192,163				192,580		194,631		183,690
Accumulated deficit	(221,556)	(196,157)	(178,348)				(196,157)		(221,556)		(172,444)	$ (146,400)
Total stockholders' equity (deficit)	(26,920)	(3,585)	13,791	$ 17,411	$ 19,409	$ 24,987	(3,585)	$ 19,409	(26,920)	$ 17,411	11,208		$ 30,928
Total liabilities and stockholders' equity (deficit)	20,353	21,593	21,013				21,593		20,353		16,925
Gain (loss) from change in fair value of warrant liability	1,591	(560)	0	0	0	0	(560)	0	1,031	0
Transaction costs allocated to warrant liabilities	(530)	(1,207)	0	0	0	0	(1,207)	0	(1,737)	0
Loss On Issuance of Warrant Liabilities	(20,609)	(10,352)	0	0	0	0	(10,352)	0	(30,962)	0
Net loss	$ (25,399)	$ (17,809)	$ (5,904)	$ (7,024)	$ (6,015)	$ (6,425)	$ (23,713)	$ (12,440)	$ (49,112)	$ (19,464)
Net loss per common share - basic and diluted (in dollars per share)	$ (0.68)	$ (1.15)	$ (0.63)	$ (1.89)	$ (2.37)	$ (2.61)	$ (1.9)	$ (4.97)	$ (2.36)	$ (6.69)
Other comprehensive income (loss)	$ (25,405)	$ (17,809)	$ (5,901)	$ (7,010)	$ (6,007)	$ (6,434)	$ (23,710)	$ (12,441)	$ (49,115)	$ (19,451)
Previously Reported [Member]
Warrant liability - long-term	48,660	20,553	13,749				20,553		48,660		5,229
Total liabilities	54,600	28,758	20,971				28,758		54,600		10,946
Additional paid-in capital	162,337	160,286	159,869				160,286		162,337		159,384
Accumulated deficit	(196,589)	(167,443)	(159,803)				(167,443)		(196,589)		(153,367)	$ (131,600)
Total stockholders' equity (deficit)	(34,247)	(7,165)	42				(7,165)		(34,247)		5,979
Total liabilities and stockholders' equity (deficit)	20,353	21,593	21,013				21,593		20,353		16,925
Gain (loss) from change in fair value of warrant liability	(2,157)	9,609	9,054	(1,728)	1,696	1,455	18,663	3,151	16,506	1,423
Transaction costs allocated to warrant liabilities	(530)	(1,207)	(1,788)	(993)	0	0	(2,995)	0	(3,525)	(993)
Loss On Issuance of Warrant Liabilities	(20,609)	(10,352)	(7,798)	(847)	0	0	(18,150)	0	(38,760)	(847)
Net loss	$ (29,147)	$ (7,640)	$ (6,436)	$ (10,592)	$ (4,319)	$ (4,970)	$ (14,076)	$ (9,289)	$ (43,223)	$ (19,881)
Net loss per common share - basic and diluted (in dollars per share)	$ (0.78)	$ (0.49)	$ (0.69)	$ (2.85)	$ (1.7)	$ (2.02)	$ (1.13)	$ (3.71)	$ (2.08)	$ (6.83)
Other comprehensive income (loss)	$ (29,153)	$ (7,640)	$ (6,433)	$ (10,578)	$ (4,311)	$ (4,979)	$ (14,073)	$ (9,290)	$ (43,226)	$ (19,868)
Revision of Prior Period, Change in Accounting Principle, Adjustment [Member]
Warrant liability - long-term	(7,327)	(3,580)	(13,749)				(3,580)		(7,327)		(5,229)
Total liabilities	(7,327)	(3,580)	(13,749)				(3,580)		(7,327)		(5,229)
Additional paid-in capital	32,294	32,294	32,294				32,294		32,294		24,306
Accumulated deficit	(24,967)	(28,714)	(18,545)				(28,714)		(24,967)		(19,077)
Total stockholders' equity (deficit)	7,327	3,580	13,749				3,580		7,327		5,229
Total liabilities and stockholders' equity (deficit)	0	0	0				0		0		$ 0
Gain (loss) from change in fair value of warrant liability	3,748	(10,169)	(9,054)	1,728	(1,696)	(1,455)	(19,223)	(3,151)	(15,475)	(1,423)
Transaction costs allocated to warrant liabilities	0	0	1,788	993	0	0	1,788	0	1,788	993
Loss On Issuance of Warrant Liabilities	0	0	7,798	847	0	0	7,798	0	7,798	847
Net loss	$ 3,748	$ (10,169)	$ 532	$ 3,568	$ (1,696)	$ (1,455)	$ (9,637)	$ (3,151)	$ (5,889)	$ 417
Net loss per common share - basic and diluted (in dollars per share)	$ 0.1	$ (0.66)	$ 0.06	$ 0.96	$ (0.67)	$ (0.59)	$ (0.77)	$ (1.26)	$ (0.28)	$ 0.14
Other comprehensive income (loss)	$ 3,748	$ (10,169)	$ 532	$ 3,568	$ (1,696)	$ (1,455)	$ (9,637)	$ (3,151)	$ (5,889)	$ 417