Note 13 - Taxes on Income - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 01, 2017	Jan. 03, 2016	Dec. 28, 2014
Income taxes at U.S federal statutory rate	$ 27,698	$ 37,018	$ 12,510
State income taxes, net of federal tax effect	1,861	3,003	57
Non-deductible business expenses	538	614	570
Non-deductible employee compensation	361	168	491
Tax effects of Company owned life insurance	(199)	128	(395)
Tax effects of undistributed earnings from foreign subsidiaries not deemed to be indefinitely reinvested	463	458	362
Foreign and U.S. tax effects attributable to foreign operations	(3,963)	(3,347)	(3,021)
Valuation allowance effect – State NOL	(1,272)	(3,797)	468
Federal tax credits	(494)	(352)	0
Other	(19)	(545)	(108)
Income tax expense	$ 24,974	$ 33,348	$ 10,934