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Note 10 - Equity Plans - Stock-based Compensation Expense Recognized on Restricted Stock Units (Details) - Restricted Stock Units (RSUs) [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
RSU (income) expense after taxes $ 636 $ 81 $ 631
New Plan [Member]      
RSU (income) expense before taxes 560 42
Old Plan [Member]      
RSU (income) expense before taxes $ (73) $ 1,047