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Note 7 - 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, 2017
Mar. 31, 2016
RSU expense after taxes $ 73 $ 146
New Plan [Member]    
RSU expense before taxes of New Plan 120
Old Plan [Member]    
RSU expense before taxes of New Plan $ 239