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Note 7 - Income Taxes (Details Textual) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 29, 2019	Dec. 31, 2019
Effective Income Tax Rate Reconciliation, Percent, Total	23.90%	20.50%
Deferred Tax Assets, Valuation Allowance, Total	$ 0
Unrecognized Tax Benefits, Ending Balance	$ 0		$ 0
General Business Tax Credit Carryforward [Member]
Tax Credit Carryforward, Amount			1,907
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards, Total			$ 58,400
Open Tax Year	2016 2017 2018
Foreign Tax Authority [Member]
Open Tax Year	2010 2011 2012 2013 2014 2015 2016 2017 2018 2019
Foreign Tax Authority [Member] | Her Majesty's Revenue and Customs (HMRC) [Member]
Operating Loss Carryforwards, Total	$ 10,000
State and Local Jurisdiction [Member]
Open Tax Year	2001 2002 2005 2006 2007 2011 2012 2013 2014 2015 2016 2017 2018 2019

X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

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

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Tax year that remains open to examination under enacted tax laws, in CCYY format.

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