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Note 8 - Income Taxes (Details Textual) - USD ($) $ in Thousands	9 Months Ended
	Sep. 29, 2019	Sep. 30, 2018	Jun. 30, 2019	Dec. 31, 2018
Effective Income Tax Rate Reconciliation, Percent, Total	20.50%	4.00%
Operating Loss Carryforwards, Valuation Allowance, Total	$ 10,000
Unrecognized Tax Benefits, Ending Balance	$ 0			$ 0
General Business Tax Credit Carryforward [Member]
Tax Credit Carryforward, Amount				1,817
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards, Total				$ 63,388
Open Tax Year	2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018
Foreign Tax Authority [Member]
Open Tax Year	2010 2011 2012 2013 2014 2015 2016 2017 2018
Foreign Tax Authority [Member] | Her Majesty's Revenue and Customs (HMRC) [Member]
Operating Loss Carryforwards, Total			$ 0
State and Local Jurisdiction [Member]
Open Tax Year	2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018

X

- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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