Note 2 - Summary of Operating Results (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Broadcast Microwave Services, Inc. (“BMS”) [Member]
Net sales	$ 6,965	$ 16,694	$ 17,063
Operating loss before income taxes	(1,963)	$ (10,305)	$ (6,142)
Gain (loss) from disposal of segment	$ (3,573)
Cohu Electronics [Member]
Net sales		$ 5,460	$ 15,726
Operating loss before income taxes		(242)	$ 1,317
Gain (loss) from disposal of segment		4,434
Net sales	$ 6,965	22,154	$ 32,789
Operating loss before income taxes	(1,963)	(10,547)	(4,825)
Gain (loss) from disposal of segment	(5,536)	(6,113)	(4,825)
Income tax provision	6	(41)	45
Loss, net of tax	$ (5,542)	$ (6,072)	$ (4,870)