Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 28, 2020	Mar. 30, 2019
Net sales		$ 138,921	$ 147,809
Cost and expenses:
Cost of sales (1)	[1]	82,837	93,394
Research and development		22,468	22,733
Selling, general and administrative		33,352	38,286
Amortization of purchased intangible assets		9,538	10,019
Restructuring charges		403	1,361
Impairment charges related to indefinite lived intangibles		3,949
Costs and Expenses, Total		152,547	165,793
Loss from operations		(13,626)	(17,984)
Other (expense) income:
Interest expense		(4,427)	(5,507)
Interest income		147	222
Foreign transaction gain (loss)		(404)	218
Loss from continuing operations before taxes		(18,310)	(23,051)
Income tax benefit		(992)	(200)
Loss from continuing operations		(17,318)	(22,851)
Income from discontinued operations		42	164
Net loss		(17,276)	(22,687)
Net loss attributable to noncontrolling interest			(44)
Net loss attributable to Cohu		$ (17,276)	$ (22,643)
Weighted average shares used in computing income (loss) per share:
Basic (in shares)		41,502	40,872
Diluted (in shares)		41,502	40,872
Cash dividends declared per share (in dollars per share)		$ 0.06	$ 0.06
Basic:
Loss from continuing operations before noncontrolling interest (in dollars per share)		(0.42)	(0.56)
Income from discontinued operations (in dollars per share)	[1]	0	0.01
Net loss attributable to noncontrolling interest (in dollars per share)			0
Net loss attributable to Cohu (in dollars per share)		(0.42)	(0.55)
Diluted:
Loss from continuing operations before noncontrolling interest (in dollars per share)		(0.42)	(0.56)
Income from discontinued operations (in dollars per share)	[1]	0	0.01
Net loss attributable to noncontrolling interest (in dollars per share)			0
Net loss attributable to Cohu (in dollars per share)		$ (0.42)	$ (0.55)

[1] Excludes amortization of $7,266 and $7,641 for the three months ended March 28, 2020 and March 30, 2019, respectively.