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Note 1 - Organization and Summary of Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands
6 Months Ended
Jul. 28, 2023
Jun. 30, 2026
Dec. 31, 2025
Retained Earnings (Accumulated Deficit)   $ (1,054,457) $ (1,082,015)
Cash, Cash Equivalents, and Short-Term Investments   612,300  
Commercialization Agreement With Neuraxpharm [Member]      
License and Collaboration Agreements, One-time, Non-refundable Payment $ 140,000 $ 445,300