Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Net sales		$ 150,647	$ 143,498	$ 433,652	$ 441,318
Cost and expenses:
Cost of sales (1)	[1]	87,147	84,565	253,111	265,564
Research and development		20,497	20,483	63,389	65,324
Selling, general and administrative		31,336	33,690	95,664	108,404
Amortization of purchased intangible assets		9,783	9,969	28,848	29,975
Restructuring charges		412	814	1,400	10,720
Impairment charges related to indefinite lived intangibles		7,300	0	11,249	0
Gain on sale of facilities		(4,468)	0	(4,495)	0
Costs and Expenses, Total		152,007	149,521	449,166	479,987
Loss from operations		(1,360)	(6,023)	(15,514)	(38,669)
Other (expense) income:
Interest expense		(3,021)	(5,000)	(10,904)	(15,789)
Interest income		42	190	210	603
Foreign transaction gain (loss)		(1,484)	1,630	(2,528)	1,302
Gain on extinguishment of debt		293	0	293	0
Loss from continuing operations before taxes		(5,530)	(9,203)	(28,443)	(52,553)
Income tax provision		1,116	1,277	261	161
Loss from continuing operations		(6,646)	(10,480)	(28,704)	(52,714)
Income from discontinued operations		0	154	42	342
Net loss		(6,646)	(10,326)	(28,662)	(52,372)
Net income attributable to noncontrolling interest		0	142	0	62
Net loss attributable to Cohu		$ (6,646)	$ (10,468)	$ (28,662)	$ (52,434)
Basic:
Loss from continuing operations before noncontrolling interest (in dollars per share)		$ (0.16)	$ (0.25)	$ (0.69)	$ (1.28)
Income from discontinued operations (in dollars per share)		0	0.00	0.00	0.00
Net income attributable to noncontrolling interest (in dollars per share)		0	0.00	0	0.00
Net loss attributable to Cohu (in dollars per share)		(0.16)	(0.25)	(0.69)	(1.28)
Diluted:
Loss from continuing operations before noncontrolling interest (in dollars per share)		(0.16)	(0.25)	(0.69)	(1.28)
Income from discontinued operations (in dollars per share)		0	0.00	0.00	0.00
Net income attributable to noncontrolling interest (in dollars per share)		0	0.00	0	0.00
Net loss attributable to Cohu (in dollars per share)		$ (0.16)	$ (0.25)	$ (0.69)	$ (1.28)
Weighted average shares used in computing loss per share:
Basic (in shares)		41,947	41,229	41,764	41,075
Diluted (in shares)		41,947	41,229	41,764	41,075
Cash dividends declared per share (in dollars per share)		$ 0	$ 0.06	$ 0.06	$ 0.18

[1] Excludes amortization of $7,447 and $7,597 for the three months ended September 26, 2020 and September 28, 2019, respectively, and $21,969 and $22,863 for the nine months ended September 26, 2020 and September 28, 2019, respectively.