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Note 7 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Effective Income Tax Rate Reconciliation, Percent, Total	60.90%	24.20%
Unrecognized Tax Benefits, Ending Balance	$ 0		$ 0
Domestic Tax Authority [Member] \| Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards			44,716
Tax Credit Carryforward, Amount			$ 2,239
Open Tax Year			2002 2005 2006 2007 2011 2012 2013 2014 2015
Foreign Tax Authority [Member]
Deferred Tax Assets, Valuation Allowance, Total	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	$ 11,000
State and Local Jurisdiction [Member]
Open Tax Year			2002 2005 2006 2007 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021