Note 5 - Financial Instruments Measured at Fair Value - Effective Maturities of Short-term Investments (Details) - USD ($) $ in Thousands	Apr. 01, 2023	Dec. 31, 2022
Due in one year or less, amortized cost	$ 66,392	$ 112,956
Due in one year or less, fair value	66,139	112,683
Due after one year through three years, amortized cost	31,695	30,996
Due after one year through three years, fair value	31,507	30,552
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost, Total	98,087	143,952
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value, Total	$ 97,646	$ 143,235