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Note 6 - Marketable Equity Securities (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Proceeds from Sale of Equity Securities, FV-NI |  | $ 1,919 | $ 0 |
Harvard Apparatus Regenerative Technology, Inc. (“HART”) [Member] |  |  |  |
Investment Owned, Fair Value |  |  |  | $ 3,500
Proceeds from Sale of Equity Securities, FV-NI | $ 1,400 | 1,900 |  |
Equity Securities, FV-NI, Realized Loss | $ 300 | $ 1,600 |  |

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