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Note 8 - Fair Value Measurements (Details Textual) - USD ($)
$ in Millions
Jan. 01, 2023
Jan. 02, 2022
Equity Securities without Readily Determinable Fair Value, Amount $ 0.3 $ 0.3
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 0.00  
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  
Asset Pledged as Collateral [Member] | Credit Card Debt [Member]    
Money Market Funds, at Carrying Value $ 0.1 0.1
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 $ 19.2 $ 19.6