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Note 7 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Effective Income Tax Rate Reconciliation, Percent 5.40% 5.30%  
Income Tax Expense (Benefit) $ (221) $ (532)  
Unrecognized Tax Benefits 4,900   $ 4,900
Accounting Standards Update 2016-09 [Member]      
Income Tax Expense (Benefit) $ 800