Note 15 - Taxes on Income (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2018	Dec. 31, 2017	Jan. 01, 2017	Jan. 03, 2016
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Transition Tax on Accumulated Foreign Earnings, Amount	$ (5,000)	$ 11,707	$ 0
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability		$ 3,500
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act of 2017, Change in Enacted Tax Rate, Amount	$ (1,700)
Effective Income Tax Rate Reconciliation, Percent, Total	8.60%	47.00%	31.60%
Deferred Tax Liabilities, Intangible Assets	$ 18,699	$ 1,157
Operating Loss Carryforwards, Valuation Allowance, Total	1,067	1,186
Increase (Decrease) in Deferred Tax Assets	(2,800)	(3,300)
Unrecognized Tax Benefits, Ending Balance	28,143	$ 29,221	$ 27,888	$ 28,271
Unrecognized Tax Benefits That Would Require To Settle Through Cash	25,400
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total	1,300
Discontinued Operations [Member]
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	43,000
State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Total	96,100
Operating Loss Carryforwards, Valuation Allowance, Total	$ 16,300
State and Local Jurisdiction [Member] | Earliest Tax Year [Member]
Open Tax Year	2013
Foreign Tax Authority [Member] | Earliest Tax Year [Member]
Open Tax Year	2007
Foreign Tax Authority [Member] | Foreign Tax Authorities Excluding Canada [Member]
Undistributed Earnings of Foreign Subsidiaries	$ 376,000
Domestic Tax Authority [Member] | Earliest Tax Year [Member]
Open Tax Year	2003
Nora [Member]
Deferred Tax Liabilities, Intangible Assets	$ 18,000