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Note 6 - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Income Tax Expense (Benefit)	$ 1,951	$ (326)
Income Tax Expense (Benefit)	(1,951)	326
Operating Loss Carryforwards	1,300
Deferred Tax Assets, Valuation Allowance	2,441	2,416
Unrecognized Tax Benefits, Ending Balance	0
General Business Tax Credit Carryforward [Member]
Tax Credit Carryforward, Amount		$ 2,900
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards	$ 27,200
Open Tax Year	2002 2005 2006 2007 2011 2012 2013 2014 2015
Foreign Tax Authority [Member]
Deferred Tax Assets, Valuation Allowance	$ 0
Open Tax Year	2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021
Foreign Tax Authority [Member] | Her Majesty's Revenue and Customs (HMRC) [Member]
Operating Loss Carryforwards	$ 9,800
State and Local Jurisdiction [Member]
Open Tax Year	2002 2005 2006 2007 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021

X

- Definition

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

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