Note 7 - Financial Instruments Measured at Fair Value - Short-term Investments by Security Type (Details) - USD ($) $ in Thousands		Dec. 28, 2019	Dec. 29, 2018
Estimated Fair Value		$ 904	$ 560
Debt Security, Government, Non-US [Member]
Amortized Cost		904	560
Gross Unrealized Gains
Gross Unrealized Losses	[1]
Estimated Fair Value		$ 904	$ 560

[1] As of December 28, 2019 and December 29, 2018 we had no investments with loss positions.