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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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Stock-based compensation expense $ 97 $ 220 $ 294 $ (39)
New Plan [Member]        
Stock-based compensation expense 141 408
Old Plan [Member]        
Stock-based compensation expense $ 162 $ (170)