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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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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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