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Note 11 - Equity Incentive Plan - Total Stock-based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Stock-based compensation expense | $ 2,545 | $ 2,259
Cost of Sales [Member] |  |
Stock-based compensation expense | 176 | 129
Research and Development Expense [Member] |  |
Stock-based compensation expense | 367 | 241
Selling, General and Administrative Expenses [Member] |  |
Stock-based compensation expense | $ 2,002 | $ 1,889

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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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