Note 4 - Balance Sheet Components - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Jul. 03, 2021	Jan. 02, 2021
Property, Plant and Equipment, Net	$ 37,475	$ 39,666
UNITED STATES
Property, Plant and Equipment, Net	27,685	29,440
TAIWAN, PROVINCE OF CHINA
Property, Plant and Equipment, Net	4,793	5,171
PHILIPPINES
Property, Plant and Equipment, Net	2,668	2,912
CHINA
Property, Plant and Equipment, Net	1,764	1,537
JAPAN
Property, Plant and Equipment, Net	458	476
Other [Member]
Property, Plant and Equipment, Net	107	130
Foreign Countries [Member]
Property, Plant and Equipment, Net	$ 9,790	$ 10,226