Note 15 - Taxes on Income - Net Deferred Tax Asset (Details) - USD ($) $ in Thousands	Dec. 30, 2018	Dec. 31, 2017
Deferred tax asset	$ 15,601	$ 18,003
Deferred income taxes (non-current liabilities)	(26,488)	(6,935)
Total net deferred taxes	(10,887)
Total net deferred taxes		11,068
Basis differences of property and equipment, assets	0	0
Basis differences of property and equipment, liabilities	24,871	13,281
Basis difference of intangible assets, assets	0	0
Deferred Tax Liabilities, Intangible Assets	18,699	1,157
Foreign currency, assets	0	0
Foreign currency, liabilities	2,357	2,597
Net operating loss carryforwards, assets	2,349	2,468
Net operating loss carryforwards, liabilities	0	0
Valuation allowances on net operating loss carryforwards, assets	(1,067)	(1,186)
Valuation allowances on net operating loss carryforwards, liabilities	0	0
Federal tax credits, assets	0	3,227
Federal tax credits, liabilities	0	0
Deferred compensation, assets	18,945	20,220
Deferred compensation, liabilities	0	0
Basis difference of inventory, assets	4,712	634
Basis difference of inventory, liabilities	0	0
Basis difference of prepaids, accruals and reserves, assets	6,473	1,777
Basis difference of prepaids, accruals and reserves, liabilities	0	0
Pensions, assets	4,290	2,408
Pensions, liabilities	0	0
Foreign withholding taxes on unremitted earnings, liabilities	348	909
Basis difference of other assets and liabilities, assets	0	0
Basis difference of other assets and liabilities, liabilities	314	536
Deferred tax assets	35,702	29,548
Deferred tax liabilities	$ 46,589	$ 18,480