Note 9 - Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Loss before income taxes, as reported in the consolidated statements of operations	$ 13,062	$ (198,335)	$ (348,101)
Computed “expected” tax benefit	2,743	(41,650)	(73,101)
Expected benefit from state and local taxes	111	(7,242)	(3,445)
Research and development credits	3,430	6,389	8,337
Officer Compensation Limitation	1,167	4,391	439
Other	(179)	374	428
Stock options	(12,445)	17,599	(6,726)
Change in state tax rates	(5,531)	0	0
Change in the balance of the valuation allowance for deferred tax assets	17,954	32,917	90,742
Income Tax Expense (Benefit)	$ 390	$ 0	$ 0