Note 15 - Income Taxes - Income Tax Provision Reconciliation (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Dec. 30, 2017	Dec. 28, 2019	Dec. 29, 2018
Federal statutory rate	35.00%	21.00%	21.00%
Tax expense on taxable (loss) income at federal statutory rate		$ 1,013	$ 821
State and Puerto Rico income taxes, net of Federal income tax benefit		305	91
Prior year United States R&D tax credits in current year		(668)	(341)
Permanent differences		77	49
Foreign income tax rates		(101)	(173)
Adjustments to NOL and repatriation taxes		154	730
Other		(16)	16
Total income tax expense		$ 764	$ 1,193