Note 5 - Financial Instruments Measured at Fair Value - Effective Maturities of Short-term Investments (Details) $ in Thousands	Dec. 30, 2023 USD ($)
Due in one year or less, amortized cost	$ 57,981
Due in one year or less, fair value	57,887
Due after 1 year through 5 years, amortized cost	31,378
Due after 1 year through 5 years, fair value	31,546
Due after 5 years through 10 years, amortized cost	741
Due after 5 years through 10 years, fair value	741
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost, Total	90,100
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value, Total	$ 90,174