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Note 7 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Effective Income Tax Rate Reconciliation, Percent, Total | 30.50% | 23.70% |
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 | $ 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 |  |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
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