Note 15 - Income Taxes (Details Textual) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Dec. 30, 2017	Dec. 28, 2019	Dec. 29, 2018
Effective Income Tax Rate Reconciliation, Percent, Total		15.80%	30.50%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%	21.00%	21.00%
Income Tax Expense (Benefit), Total		$ 764	$ 1,193
Effective Income Tax Rate Reconciliation, Tax Credit, Amount, Total		668	341
Effective Income Tax Rate Reconciliation, NOL Adjustments and Repatriation Taxes, Amount		154	730
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount		(101)	(173)
Effective Income Tax Rate Reconciliation, Operating Loss Carryforwards Adjustments			700
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Amount			$ 700
Domestic Tax Authority [Member]
Operating Loss Carryforwards, Total		$ 100
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Income Tax Examination, Year under Examination		2013 2014 2015 2016 2017
State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Total		$ 5,000
State and Local Jurisdiction [Member] | New Jersey Division of Taxation [Member]
Income Tax Examination, Year under Examination		2009 2010 2011 2012