Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018
Cash flows from operating activities:
Net income (loss) attributable to Cohu	$ (41,966,000)	$ 19,770,000
Net loss attributable to noncontrolling interest	(80,000)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Loss on disposal of assets	237,000	40,000
Depreciation and amortization	30,143,000	4,874,000
Share-based compensation expense	7,355,000	3,617,000
Amortization of inventory step-up and inventory related charges	5,245,000
Deferred income taxes	(7,460,000)	486,000
Increase in accrued retiree medical benefits	443,000
Changes in other accrued liabilities	2,693,000	(294,000)
Changes in other assets	(971,000)	(322,000)
Amortization of debt discounts and issuance costs	546,000	0
Adjustment to contingent consideration liability		428,000
Changes in current assets and liabilities, excluding effects from acquisitions:
Accounts receivable	14,746,000	(21,289,000)
Other current assets	(8,609,000)	(2,432,000)
Inventories	(2,499,000)	(1,396,000)
Deferred profit	1,266,000	(3,653,000)
Accounts payable	4,019,000	3,853,000
Income taxes payable	(4,097,000)	1,728,000
Accrued compensation, warranty and other liabilities	(5,784,000)	505,000
Net cash provided by (used in) operating activities	(4,773,000)	5,915,000
Cash flows from investing activities, excluding effects from acquisitions:
Purchases of property, plant and equipment	(8,397,000)	(1,860,000)
Purchases of short-term investments		(27,374,000)
Sales and maturities of short-term investments		24,838,000
Cash received from sale of fixed assets	811,000	4,000
Net cash used in investing activities	(7,586,000)	(4,392,000)
Cash flows from financing activities:
Cash dividends paid	(4,893,000)	(3,484,000)
Repurchases of common stock, net	(1,099,000)	(2,638,000)
Payment of contingent consideration for Kita		(823,000)
Repayments of long-term debt	(2,611,000)	(686,000)
Net cash used in financing activities	(8,603,000)	(7,631,000)
Effect of exchange rate changes on cash and cash equivalents	(195,000)	(1,170,000)
Net decrease in cash and cash equivalents	(21,157,000)	(7,278,000)
Cash and cash equivalents including discontinued operations at beginning of period	164,921,000	134,286,000
Cash and cash equivalents including discontinued operations at end of period	143,764,000	127,008,000
Cash held by discontinued operations at end of period (Note 10)	(750,000)
Cash and cash equivalents from continuing operations at end of the period	143,014,000	127,008,000
Supplemental disclosure of cash flow information:
Cash paid for interest	10,088,000
Cash paid for income taxes	10,690,000	2,608,000
Inventory capitalized as property, plant and equipment	195,000	149,000
Dividends declared but not yet paid	2,466,000	1,733,000
Property, plant and equipment purchases included in accounts payable	938,000	166,000
Capitalized cloud computing service costs included in accounts payable	$ 1,477,000