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Note 7 - Stock Based Compensation Expense Recognized on Restricted Stock Units (Details) - Restricted Stock Units (RSUs) [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Expense Before Tax [Member]    
RSU expense before taxes $ 239 $ 231
Expense After Tax [Member]    
RSU expense after taxes $ 146 $ 141