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Note 3 - Stock-based Compensation (Details Textual) - USD ($) shares in Thousands | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares, Ending Balance (in shares) | 0 | 0 |  |  |  |
Share-based Payment Arrangement, Expense | $ (408,000) | $ 90,000 |  |  |  |
Deferred Compensation Share-based Arrangements, Liability, Current and Noncurrent | 287,000 | $ 236,000 |  |  |  |
Restricted Stock [Member] |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount | $ 219,000 |  |  |  |  |
Restricted Stock [Member] | Forecast [Member] |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount |  |  | $ 4,000 | $ 34,000 | $ 88,000 | $ 94,000

X
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- Definition Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of non-vested options outstanding. + References No definition available. + Details
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