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Note 2 - Earnings Per Common Share (Details) - Earnings Per Common Share (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Numerator:          
Net income (in Dollars) $ 7,667 $ 7,584 $ 14,869 $ 14,237 $ 13,030
Denominator:          
Basic earnings per common share - weighted-average shares 33,210 33,099 33,196   33,075
Effect of dilutive stock options 168 151 148   156
Diluted earnings per common share - weighted-average shares and assumed conversions 33,378 33,250 33,344   33,231
Basic earnings per common share (in Dollars per share) $ 0.23 $ 0.23 $ 0.45   $ 0.39
Diluted earnings per common share (in Dollars per share) $ 0.23 $ 0.23 $ 0.45   $ 0.39