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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 | $ 2,548 | $ 3,891 | $ 5,543 | $ 7,481
Cost of Sales [Member] |  |  |  |
Stock-based compensation expense | 56 | 173 | 162 | 299
Research and Development Expense [Member] |  |  |  |
Stock-based compensation expense | 183 | 572 | 625 | 1,102
Selling, General and Administrative Expenses [Member] |  |  |  |
Stock-based compensation expense | $ 2,309 | $ 3,146 | $ 4,756 | $ 6,080

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