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Note 8 - Stock Based Compensation Expense Recognized on Restricted Stock Units (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Restricted Stock Units (RSUs) [Member] | Expense Before Tax [Member]        
RSU expense before taxes $ 326 $ 360 $ 867 $ 881
Restricted Stock Units (RSUs) [Member] | Expense After Tax [Member]        
RSU expense after taxes $ 188 $ 225 $ 530 $ 561
Impact Share Type [Member]        
Impact per basic share (in dollars per share) $ 0.02 $ 0.02 $ 0.05 $ 0.05
Impact per diluted share (in dollars per share) 0.02 0.02 0.05 0.05
Impact per basic share (in dollars per share) (0.05) 0.14 (1.95) 0.70
Impact per diluted share (in dollars per share) $ (0.05) $ 0.14 $ (1.95) $ 0.70