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Note 2 - Business Acquisitions, Goodwill and Other Purchased Intangible Assets - Changes in Carrying Value of Goodwill (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 30, 2017
Beginning balance $ 65,613 [1] $ 58,849
Additions, net   2,654
Impact of currency exchange (848) 4,110
Ending balance $ 64,765 $ 65,613 [1]
[1] Derived from December 30, 2017 audited financial statements