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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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
RSU expense (income) after taxes $ 91 $ (289) $ 194 $ (160)
New Plan [Member]        
RSU expense before taxes of New Plan 147 267
Old Plan [Member]        
RSU expense before taxes of New Plan $ (570) $ (332)