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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