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Note 4 - Earnings Per Share (Detail) - Basic and Diluted Earnings Per Share (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Numerator:        
Numerator for basic and diluted earnings per share – Net income available to common shareholders (in Dollars) $ 14,909,000 $ 16,045,000 $ 48,237,000 $ 35,830,000
Denominator–        
Denominator for basic earnings per share – weighted average shares outstanding 38,740,275 37,932,300 38,602,099 37,796,072
Effect of dilutive securities– Employee and director stock options and restricted share awards 861,913 1,026,598 1,030,779 1,159,396
Denominator for diluted earnings per share – adjusted weighted average shares outstanding and assumed conversions 39,602,188 38,958,898 39,632,878 38,955,468
Basic earnings per common share (in Dollars per share) $ 0.38 $ 0.42 $ 1.25 $ 0.95
Diluted earnings per common share and common share equivalents (in Dollars per share) $ 0.38 $ 0.41 $ 1.22 $ 0.92