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Note 10 - Stock-based Compensation - Allocation of Share-based Compensation Expense (Details) - Restricted Stock [Member] - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Allocation of Share-based Compensation Expense | $ 371 | $ 85 | $ 1,094 | $ 480
Cost of Sales [Member] |  |  |  |
Allocation of Share-based Compensation Expense | 10 | 0 | 17 | 0
Selling and Marketing Expense [Member] |  |  |  |
Allocation of Share-based Compensation Expense | 8 | 3 | 17 | 9
Research and Development Expense [Member] |  |  |  |
Allocation of Share-based Compensation Expense | 17 | 10 | 43 | 31
General and Administrative Expense [Member] |  |  |  |
Allocation of Share-based Compensation Expense | $ 336 | $ 72 | $ 1,017 | $ 440

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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