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Note 4 - Investment in Equity Securities (Details Textual)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended
Dec. 23, 2022
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount   $ (0) $ (0) $ 2,990 $ 2,990 $ (0)
Measurement Input, Expected Term [Member]            
Equity Securities without Readily Determinable Fair Value, Measurement Input       3.5    
Measurement Input, Probability [Member] | Valuation, Dynamic Options Approach [Member]            
Equity Securities without Readily Determinable Fair Value, Measurement Input       0.50    
Measurement Input, Probability [Member] | Valuation, Cost Approach [Member]            
Equity Securities without Readily Determinable Fair Value, Measurement Input       0.50    
Dynamic Cell Therapies, Inc. [Member]            
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage 19.00%          
Dynamic Cell Therapies, Inc. [Member]            
Payments to Acquire Equity Securities without Readily Determinable Fair Value $ 4,700