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Note 8 - Net Income Per Common Share (Details) - Net Income per Common Share Calculation (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Net Income per Common Share Calculation [Abstract]        
Net income available to common shareholders (in Dollars) $ 13,937 $ 11,615 $ 39,097 $ 34,579
Average common shares outstanding 26,024 25,784 25,978 25,689
Adjustment for common share equivalents 630 642 640 615
Average common shares outstanding-diluted 26,654 26,426 26,618 26,304
Diluted net income per common share (in Dollars per share) $ 0.52 $ 0.44 $ 1.47 $ 1.31
Anti-dilutive shares 21,000 95,966 21,000 101,466
Basic net income per common share (in Dollars per share) $ 0.54 $ 0.45 $ 1.50 $ 1.35