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Note 6 - Stock-based Compensation Expense and Related Income Tax Benefit (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Stock-based compensation expense, gross $ 1,284 $ 993
Income tax benefit at our statutory rate associated with stock-based compensation (501) (387)
Stock-based compensation expense, net $ 783 $ 606