- Short Term Investments (Details) - USD ($) $ in Thousands	Dec. 28, 2019	Dec. 29, 2018
Components of available for sale securities
Total short term investments	$ 17,016	$ 32,035
Total short term investments, Fair Market Value	17,032	31,605
Corporate and government bonds
Components of available for sale securities
Total short term investments	17,016	30,035
Total short term investments, Fair Market Value	17,032	29,605
Convertible note
Components of available for sale securities
Total short term investments	0	2,000
Total short term investments, Fair Market Value	$ 0	$ 2,000