Note 15 - Taxes on Income - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2018	Dec. 31, 2017	Jan. 01, 2017
Income taxes at U.S. federal statutory rate	$ 11,548	$ 35,189	$ 27,698
State income taxes, net of federal tax effect	2,304	2,677	1,861
Non-deductible business expenses	1,352	695	538
Non-deductible employee compensation	2,566	80	361
Tax effects of Company owned life insurance	235	(1,295)	(199)
One-time transition tax on foreign earnings	(5,000)	11,707	0
Remeasurement of net Deferred Tax Asset	(1,739)	3,467	0
Tax effects of undistributed earnings from foreign subsidiaries not deemed to be indefinitely reinvested	61	523	463
Foreign and U.S. tax effects attributable to foreign operations	(3,756)	(4,537)	(3,963)
Valuation allowance effect – State NOL	(79)	(858)	(1,272)
Federal tax credits	(2,439)	(442)	(494)
Other	(315)	87	(19)
Income tax expense	$ 4,738	$ 47,293	$ 24,974