Note 5 - Financial Instruments Measured at Fair Value - Short-term Investments by Security Type (Details) - USD ($) $ in Thousands		Jun. 29, 2019	Dec. 29, 2018
Short-term investments		$ 581	$ 560	[1]
Debt Security, Government, Non-US [Member]
Amortized Cost		581	560
Gross Unrealized Gains
Gross Unrealized Losses	[2]
Short-term investments		$ 581	$ 560

[1] Derived from December 29, 2018 audited financial statements

[2] As of June 29, 2019 and December 29, 2018, there were no investments in our portfolio in a loss position.