Note 14 - Income Taxes - Reconciliation of Effective Rate (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2025		Dec. 31, 2024
Income Tax Disclosure [Abstract]
Income tax at U.S. statutory rate		$ (21,930)		$ (16,890)
Income tax at U.S. statutory rate, Percent		21.10%
State income taxes, net of federal benefit		$ (373)	[1]	(1,895)
State income taxes, net of federal benefit, Percent	[1]	0.40%
Foreign tax effects		$ 0
Foreign tax effects, Percent		0.00%
U.S. federal R&D tax credits		$ (2,867)
U.S. federal R&D tax credits, Percent		2.70%
Change in valuation allowance		$ 19,086		11,517
Change in valuation allowance, Percent		(18.40%)
Impairment				5,053
Tax credits				(1,344)
Share-based compensation		$ 1,185		1,684
Share-based compensation, Percent		(1.10%)
Net operating loss expirations		$ 3,752
Net operating loss expirations, Percent		(3.60%)
Other		$ 202
Other, Percent		(0.20%)
Changes in unrecognized tax benefits		$ 152
Changes in unrecognized tax benefits, Percent		(0.10%)
Other				(222)
Total income tax benefit:		$ (793)		$ (2,097)
Effective income tax rate		0.80%		2.60%

[1] State taxes in California made up the majority (greater than 50%) of this category.