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Note 7 - Stockholders' Equity and Stock-based Compensation - Stock-based Compensation Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Total stock-based compensation expense $ 19,582 $ 16,291 $ 4,586
Research and Development Expense [Member]      
Total stock-based compensation expense 7,159 6,492 2,050
General and Administrative Expense [Member]      
Total stock-based compensation expense $ 12,423 $ 9,799 $ 2,536