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Note 11 - Employee Stock Purchase Plan (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 21 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2023 | Mar. 31, 2023 | Jun. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 23, 2021
Stock Issued During Period, Value, Employee Stock Purchase Plan | $ 49 | $ 48 | $ 65 | $ 56 |  |  |  |
Share Price (in dollars per share) | $ 26.26 | $ 20.74 |  |  | $ 26.26 |  | $ 26.26 |
Share-based Compensation Arrangement by Share-based Payment Award, Discount Amount |  |  |  |  | $ 14 | $ 18 |  |
Employee Stock Purchase Plan [Member] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) |  |  |  |  |  |  |  | 250,000
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares) |  |  |  |  | 4,162 | 14,715 | 35,314 |
Stock Issued During Period, Value, Employee Stock Purchase Plan |  |  |  |  | $ 97 | $ 121 | $ 379 |
Share Price (in dollars per share) |  |  | $ 6.82 | $ 10.73 |  | $ 6.82 |  |
Shares Issued, Price Per Share (in dollars per share) | $ 22.32 | $ 17.63 | $ 5.80 | $ 9.12 | $ 22.32 | $ 5.80 | $ 22.32 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Discount from Market Price, Purchase Date |  |  |  |  | 15.00% | 15.00% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Discount Amount |  |  |  |  | $ 14 | $ 18 |  |
Share-Based Payment Arrangement, Expense |  |  |  |  |  |  | $ 57 |

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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 -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479830/718-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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