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Note 13 - Equity Incentive Plan - Total Stock-based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Stock-based compensation expense | $ 2,215 | $ 3,118 | $ 7,758 | $ 9,908
Cost of Sales [Member] |  |  |  |
Stock-based compensation expense | 61 | 84 | 223 | 357
Research and Development Expense [Member] |  |  |  |
Stock-based compensation expense | 284 | 446 | 909 | 1,447
Selling, General and Administrative Expenses [Member] |  |  |  |
Stock-based compensation expense | $ 1,870 | $ 2,588 | $ 6,626 | $ 8,104

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