Note 15 - Income Taxes - Income Tax Provision Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 02, 2021	Dec. 28, 2019
Federal statutory rate	21.00%	21.00%
Tax expense on taxable (loss) income at federal statutory rate	$ (2,532)	$ 1,013
State and Puerto Rico income taxes, net of Federal income tax benefit	(535)	305
Prior year United States R&D tax credits in current year		(668)
Permanent differences	154	77
Foreign income tax rates	(21)	(101)
Adjustments to NOL and repatriation taxes	(53)	154
Other	(201)	(16)
Total income tax expense	$ (3,188)	$ 764