Note 9 - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Deferred Tax Assets, Valuation Allowance	$ 414,614	$ 418,317
Income Tax Expense (Benefit)	$ 2,211	$ 390	$ 0
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%	21.00%
Open Tax Year	2021 2022 2023 2024
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued		$ 0
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 0
Domestic Tax Jurisdiction [Member]
Deferred Tax Liabilities, Deferred Expense, Capitalized Research and Development Costs	78,900	61,800
Operating Loss Carryforwards	2,000
Domestic Tax Jurisdiction [Member] | Research Tax Credit Carryforward [Member]
Tax Credit Carryforward, Amount	50,700
Foreign Tax Jurisdiction [Member]
Deferred Tax Liabilities, Deferred Expense, Capitalized Research and Development Costs	$ 6,200	$ 13,900