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Note 6 - Stock-based Compensation Expense and Related Income Tax Benefit (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Stock-based compensation expense, gross $ 4,019 $ 5,012 $ 1,974
Income tax benefit at our statutory rate associated with stock-based compensation (1,567) (1,955) (770)
Stock-based compensation expense, net $ 2,452 $ 3,057 $ 1,204