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Note 6 - Shareholders' Equity (Details Textual) - Common Stock [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands |  | 3 Months Ended
--- | --- | ---
Feb. 24, 2024 | Mar. 31, 2024 | Mar. 31, 2023
Stock Issued During Period, Shares, New Issues (in shares) |  | 929 | 10
Registered Direct Offering [Member] |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 929 |  |
Shares Issued, Price Per Share (in dollars per share) | $ 35 |  |
Proceeds from Issuance of Common Stock | $ 32,500 |  |
Legal Fees | $ 282 |  |

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- Definition The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(6)) -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 + Details
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