Note 20 - Income Taxes - Deferred Tax Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Deferred tax assets:
Net operating loss carryforwards	$ 80,580	$ 69,612
Research and development credit carryforward	10,719	9,941
Stock-based compensation	215	301
Property and equipment	1,090	2,364
Operating lease liabilities	1,208	4,967
Capitalized R&D expenses	12,401	14,194
Other accruals	1,715	689
Gross deferred tax assets	107,928	102,068
Valuation allowance	(107,734)	(98,840)
Deferred tax assets net of valuation allowance	194	3,228
Deferred tax liabilities:
Right-of-use assets	(194)	(3,228)
Gross deferred tax liabilities	(194)	(3,228)
Total deferred tax assets (liabilities), net	$ 0	$ 0