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Note 7 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2017
Income Tax Expense (Benefit), Total | $ (18,386) | $ (1,369) |
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount | 18,652 |  |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability | 1,939 |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | (19,662) | (10,695) |
Deferred Tax Assets, Gross, Total | 20,676 | 21,613 |
Unrecognized Tax Benefits, Ending Balance | 0 | 0 |
Deferred Tax Assets, Valuation Allowance, Total | 1,942 | 21,604 |
Accounting Standards Update 2016-09 [Member] |  |  |
Deferred Tax Assets, Gross, Total |  |  | $ 1,123
Deferred Tax Assets, Valuation Allowance, Total |  |  | $ 1,123
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 | $ 10,220 | $ 10,220 |
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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