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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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