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Note 5 - Financial Instruments Measured at Fair Value - Effective Maturities of Short-term Investments (Details) - USD ($)
$ in Thousands
Jun. 26, 2021
Dec. 26, 2020
Due in one year or less, amortized cost $ 79,224 $ 20,668
Due in one year or less, fair value 79,239 20,669
Due after one year through three years, amortized cost 954 0
Due after one year through three years, fair value 954 0
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost, Total 80,178 20,668
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value, Total $ 80,193 $ 20,669