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Note 12 - Equity Incentive Plan - Total Stock-based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Stock-based compensation expense | $ 4,081 | $ 2,797 | $ 6,626 | $ 5,056
Cost of Sales [Member] |  |  |  |
Stock-based compensation expense | 227 | 214 | 403 | 343
Research and Development Expense [Member] |  |  |  |
Stock-based compensation expense | 503 | 402 | 870 | 643
Selling, General and Administrative Expenses [Member] |  |  |  |
Stock-based compensation expense | $ 3,351 | $ 2,181 | $ 5,323 | $ 4,070

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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