Note 4 - Balance Sheet Components - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Oct. 02, 2021	Jan. 02, 2021
Property, Plant and Equipment, Net	$ 37,261	$ 39,666
UNITED STATES
Property, Plant and Equipment, Net	26,589	29,440
TAIWAN, PROVINCE OF CHINA
Property, Plant and Equipment, Net	5,484	5,171
PHILIPPINES
Property, Plant and Equipment, Net	2,928	2,912
CHINA
Property, Plant and Equipment, Net	1,710	1,537
JAPAN
Property, Plant and Equipment, Net	436	476
Other [Member]
Property, Plant and Equipment, Net	114	130
Foreign Countries [Member]
Property, Plant and Equipment, Net	$ 10,672	$ 10,226