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Note 3 - Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2021	Mar. 28, 2020
Revenue	$ 115,716	$ 97,316
Percentage of revenue	100.00%	100.00%
UNITED STATES
Revenue	$ 9,110	$ 13,319
Percentage of revenue	8.00%	14.00%
Other Americas [Member]
Revenue	$ 6,733	$ 3,268
Percentage of revenue	6.00%	3.00%
Americas [Member]
Revenue	$ 15,843	$ 16,587
Percentage of revenue	14.00%	17.00%
CHINA
Revenue	$ 67,119	$ 43,499
Percentage of revenue	58.00%	45.00%
TAIWAN, PROVINCE OF CHINA
Revenue	$ 2,814	$ 9,859
Percentage of revenue	2.00%	10.00%
JAPAN
Revenue	$ 7,777	$ 7,999
Percentage of revenue	7.00%	8.00%
Other Asia [Member]
Revenue	$ 10,680	$ 7,336
Percentage of revenue	9.00%	8.00%
Asia [Member]
Revenue	$ 88,390	$ 68,693
Percentage of revenue	76.00%	71.00%
Europe [Member]
Revenue	$ 11,483	$ 12,036
Percentage of revenue	10.00%	12.00%
Product [Member]
Revenue	$ 111,592	$ 93,225
Percentage of revenue	96.00%	96.00%
Product [Member] | Sales Channel, Through Intermediary [Member]
Revenue	$ 98,779	$ 75,455
Percentage of revenue	85.00%	78.00%
Product [Member] | Sales Channel, Directly to Consumer [Member]
Revenue	$ 12,813	$ 17,770
Percentage of revenue	11.00%	18.00%
License and Service [Member]
Revenue	$ 4,124	$ 4,091
Percentage of revenue	4.00%	4.00%

X

- Definition

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

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