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Note 8 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Income Tax Expense (Benefit), Total | $ 1,457 | $ (18,386)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount |  | 18,652
Unrecognized Tax Benefits, Ending Balance | 0 | $ 0
General Business Tax Credit Carryforward [Member] |  |
Tax Credit Carryforward, Amount | 1,907 |
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |  |
Operating Loss Carryforwards, Total | $ 58,400 |
Open Tax Year | 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2012 2013 2014 2015 2016 2017 2018 2019 |
Foreign Tax Authority [Member] |  |
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 | $ 10,600 |
State and Local Jurisdiction [Member] |  |
Open Tax Year | 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2012 2013 2014 2015 2016 2017 2018 2019 |

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324 + Details
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