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Note 13 - Taxes on Income - Reconciliation of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Jan. 01, 2017	Jan. 03, 2016
Balance at beginning of year	$ 27,888	$ 28,271	$ 27,301
Increases related to tax positions taken during the current year	627	690	641
Increases related to tax positions taken during the prior years	709	148	1,230
Decreases related to tax positions taken during the prior years	0	(695)	(194)
Decreases related to settlements with taxing authorities	0	0	0
Decreases related to lapse of applicable statute of limitations	(462)	(403)	(367)
Changes due to foreign currency translation	459	(123)	(340)
Balance at end of year	$ 29,221	$ 27,888	$ 28,271

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+ References

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-Topic 740
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