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Note 15 - Equity-based Compensation - Summary of Stock-based Compensation Expense Included in Results of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Stock-based compensation expense | $ 154 | $ 296 | $ 338 | $ 479
Research and Development Expense [Member] |  |  |  |
Stock-based compensation expense | 5 | 3 | 9 | 7
Selling and Marketing Expense [Member] |  |  |  |
Stock-based compensation expense | 13 | 34 | 25 | 65
General and Administrative Expense [Member] |  |  |  |
Stock-based compensation expense | $ 136 | $ 259 | $ 304 | $ 407

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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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