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Note 8 - Equity Plans - Stock-based Compensation Expense Recognized on Restricted Stock Units (Details) - Restricted Stock Units (RSUs) [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
RSU expense before taxes $ 138 $ 120
RSU expense after taxes $ 102 $ 73