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Note 9 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Apr. 02, 2017
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent   34.00% 34.00%  
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability   $ (1,939)    
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount   (10,695) $ (1,262)  
Deferred Tax Assets, Gross   22,645 33,358  
Unrecognized Tax Benefits   0 0  
Deferred Tax Assets, Valuation Allowance   22,636 $ 33,331  
Domestic Tax Authority [Member]        
Operating Loss Carryforwards   69,594    
Tax Credit Carryforward, Amount   $ 1,837    
Domestic Tax Authority [Member] | Earliest Tax Year [Member] | Internal Revenue Service (IRS) [Member]        
Open Tax Year   2002    
Domestic Tax Authority [Member] | Latest Tax Year [Member] | Internal Revenue Service (IRS) [Member]        
Open Tax Year   2017    
Foreign Tax Authority [Member]        
Operating Loss Carryforwards   $ 12,760    
Foreign Tax Authority [Member] | Earliest Tax Year [Member]        
Open Tax Year   2009    
Foreign Tax Authority [Member] | Latest Tax Year [Member]        
Open Tax Year   2017    
State and Local Jurisdiction [Member] | Earliest Tax Year [Member]        
Open Tax Year   2002    
State and Local Jurisdiction [Member] | Latest Tax Year [Member]        
Open Tax Year   2017    
Accounting Standards Update 2016-09 [Member]        
Deferred Tax Assets, Gross       $ 1,123
Deferred Tax Assets, Valuation Allowance       $ 1,123
Scenario, Forecast [Member]        
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00%