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Note 8 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Effective Income Tax Rate Reconciliation, Percent, Total | 20.80% | 3.40% |
Operating Loss Carryforwards, Valuation Allowance, Total | $ 10,000 |  |
Unrecognized Tax Benefits, Ending Balance | $ 0 |  | $ 0
General Business Tax Credit Carryforward [Member] |  |  |
Tax Credit Carryforward, Amount |  |  | 1,817
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |  |  |
Operating Loss Carryforwards, Total |  |  | $ 63,388
Open Tax Year | 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 |  |
Foreign Tax Authority [Member] |  |  |
Open Tax Year | 2010 2011 2012 2013 2014 2015 2016 2017 2018 |  |
Foreign Tax Authority [Member] | Her Majesty's Revenue and Customs (HMRC) [Member] |  |  |
Operating Loss Carryforwards, Total | $ 0 |  |
State and Local Jurisdiction [Member] |  |  |
Open Tax Year | 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 |  |

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