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Note 6 - Stock-based Compensation - Non-cash Stock Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Share-based payment expense | $ 179 | $ 142 | $ 552 | $ 512
Share-Based Payment Arrangement, Option [Member] |  |  |  |
Share-based payment expense | 176 | 131 | 538 | 468
Restricted Stock [Member] |  |  |  |
Share-based payment expense | $ 3 | $ 11 | $ 14 | $ 44

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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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