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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 | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Allocation of Share-based Compensation Expense | $ 454 | $ 208 | $ 723 | $ 395
Cost of Sales [Member] |  |  |  |
Allocation of Share-based Compensation Expense | 7 | 0 | 7 | 0
Selling and Marketing Expense [Member] |  |  |  |
Allocation of Share-based Compensation Expense | 6 | 3 | 9 | 6
Research and Development Expense [Member] |  |  |  |
Allocation of Share-based Compensation Expense | 16 | 11 | 26 | 21
General and Administrative Expense [Member] |  |  |  |
Allocation of Share-based Compensation Expense | $ 425 | $ 194 | $ 681 | $ 368

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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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