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Note 9 - Stock-Based Compensation - Summary of Compensation Costs Related to Stock-Based Compensation Awards (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
Allocated share based compensation expense | $ 633 | $ 715 | $ 1,279 | $ 1,524
Cost of Sales [Member] |  |  |  |
Allocated share based compensation expense | 47 | 68 | 110 | 173
Selling, General and Administrative Expenses [Member] |  |  |  |
Allocated share based compensation expense | 476 | 526 | 949 | 1,079
Research and Development Expense [Member] |  |  |  |
Allocated share based compensation expense | $ 110 | $ 121 | $ 220 | $ 272

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- Definition Amount, after tax, of expense for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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