Note 4 - Discontinued Operations - Summary of Operating Results (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Net sales		$ 6,965	$ 22,154
Operating income (loss) before income taxes		(1,963)	(10,547)
Gain (loss) from disposal of segment	(221)	(5,536)	(6,113)
Income tax provision		6	(41)
Loss, net of tax	(221)	(5,542)	(6,072)
Broadcast Microwave Services, Inc. (“BMS”) [Member]
Net sales		6,965	16,694
Operating income (loss) before income taxes		(1,963)	(10,305)
Gain (loss) from disposal of segment	(221)	(3,573)
Cohu Electronics [Member]
Net sales			5,460
Operating income (loss) before income taxes			(242)
Gain (loss) from disposal of segment			$ 4,434

Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal.

Amount after tax of income (loss) from a discontinued operation attributable to the parent. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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