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Note 16 - Litigation Settlement (Details Textual) - USD ($) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Jun. 10, 2022 | Dec. 31, 2023 | Dec. 31, 2022
Equity Securities without Readily Determinable Fair Value, Amount | $ 3.9 |  |
Preferred Stock, Book Value, Inclusive of Accrued Dividends |  |  | $ 4.1
Harvard Apparatus Regenerative Technology, Inc. (“HART”) [Member] |  |  |
Investment Owned, Fair Value |  | $ 3.5 |
Equity Securities, FV-NI, Unrealized Gain (Loss) |  | $ 0.6 |
Case in Suffolk Superior Court [Member] | Convertible Preferred Stock [Member] |  |  |
Stock Issued During Period, Shares, Issued For Settlement (in shares) | 4,000 |  |
Stock Issued During Period, Value, Issued for Settlement | $ 4.0 |  |

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