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Note 7 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Effective Income Tax Rate Reconciliation, Percent 39.90% 2.10% 21.20% 4.00%  
Income Tax Expense (Benefit) $ (1,375) $ (131) $ (1,596) $ (663)  
Unrecognized Tax Benefits $ 4,400   4,400   $ 4,900
Accounting Standards Update 2016-09 [Member]          
Income Tax Expense (Benefit)     $ 800