Note 12 - Earnings Per Share (Detail) - Earnings Per Share Calculation (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Numerator for basic and diluted earnings per share-
Income from continuing operations available to common shareholders (in Dollars)	$ 62,455,000	$ 55,213,000	$ 24,567,000
Denominator-
Denominator for basic earnings per share, weighted average shares	38,643,189	37,860,551	37,307,453
Effect of dilutive securities-
Stock options and restricted shares	1,045,254	1,153,846	910,727
Denominator for diluted earnings per share, adjusted weighted average shares and assumed conversions	39,688,443	39,014,397	38,218,180
Basic earnings per common share (in Dollars per share)	$ 1.62	$ 1.46	$ 0.66
Diluted earnings per common share and common share equivalents (in Dollars per share)	$ 1.57	$ 1.42	$ 0.64