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Note 5 - Financial Instruments Measured at Fair Value - Effective Maturities of Short-term Investments (Details) - USD ($)
$ in Thousands
Mar. 28, 2020
Dec. 28, 2019
Due in one year or less, amortized cost $ 901
Due in one year or less, fair value 901
Due after one year through three years, amortized cost 904
Due after one year through three years, fair value 904
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost, Total 901 904
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value, Total $ 901 $ 904