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Note 8 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Income Tax Expense (Benefit), Total | $ 1,692 | $ 1,457
Deferred Tax Assets, Valuation Allowance, Total | 1,942 | 1,942
Unrecognized Tax Benefits, Ending Balance | 0 | $ 0
General Business Tax Credit Carryforward [Member] |  |
Tax Credit Carryforward, Amount | 2,070 |
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |  |
Operating Loss Carryforwards, Total | $ 47,755 |
Open Tax Year | 2001 2002 2005 2006 2007 2011 2012 2013 2014 2015 |
Foreign Tax Authority [Member] |  |
Deferred Tax Assets, Valuation Allowance, Total | $ 0 |
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 | $ 11,000 |
State and Local Jurisdiction [Member] |  |
Open Tax Year | 2001 2002 2005 2006 2007 2011 2012 2013 2014 2015 2016 2017 2018 2019 |

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