Note 8 - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Unrecognized Tax Benefits	$ 17,376	$ 10,170	$ 8,925
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	0
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	11,700	$ 8,100
Domestic Tax Jurisdiction [Member]
Operating Loss Carryforwards	250,000
Operating Loss Carryforwards, Not Subject to Expiration	224,400
Tax Credit Carryforward, Amount	9,500
State and Local Jurisdiction [Member]
Operating Loss Carryforwards	274,300
Tax Credit Carryforward, Amount	$ 9,300