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Note 9 - Fair Value Measurements (Details Textual) - USD ($)
$ in Thousands
Dec. 31, 2023
Jun. 30, 2023
Jun. 28, 2023
Apr. 28, 2023
Jan. 03, 2023
Jan. 01, 2023
Equity Securities without Readily Determinable Fair Value, Amount $ 300         $ 300
Measurement Input, Discount for Lack of Marketability [Member] | Minimum [Member]            
Equity Securities, FV-NI, Measurement Input 34          
Measurement Input, Discount for Lack of Marketability [Member] | Maximum [Member]            
Equity Securities, FV-NI, Measurement Input 41          
Measurement Input, Expected Term [Member] | Minimum [Member]            
Equity Securities, FV-NI, Measurement Input 4          
Measurement Input, Expected Term [Member] | Maximum [Member]            
Equity Securities, FV-NI, Measurement Input 5          
Measurement Input, Risk Free Interest Rate [Member] | Minimum [Member]            
Equity Securities, FV-NI, Measurement Input 0.75          
Measurement Input, Risk Free Interest Rate [Member] | Maximum [Member]            
Equity Securities, FV-NI, Measurement Input 0.92          
Measurement Input, Expected Dividend Payment [Member]            
Equity Securities, FV-NI, Measurement Input 0          
Measurement Input, Price Volatility [Member] | Minimum [Member]            
Equity Securities, FV-NI, Measurement Input 63          
Measurement Input, Price Volatility [Member] | Maximum [Member]            
Equity Securities, FV-NI, Measurement Input 78          
The Note [Member]            
Financing Receivable, after Allowance for Credit Loss, Noncurrent       $ 1,160    
Notes Receivable, Interest Rate     4.69% 3.00%    
Financing Receivable, Effective Annual Interest Rate     4.80%      
Financing Receivable, Default Interest Rate   10.00%        
Asset Pledged as Collateral [Member] | Credit Card Debt [Member]            
Money Market Funds, at Carrying Value $ 100       $ 100  
Money Market Funds [Member]            
Investment Interest Rate 0.01%          
Money Market Funds [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]            
Cash and Cash Equivalents, Fair Value Disclosure $ 24,600         $ 19,200