Note 4 - Earnings Per Share (Details) - Basic and Diluted Earnings Per 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	Jun. 30, 2012
Basic and Diluted Earnings Per Share [Abstract]
Numerator for basic and diluted earnings per share – Net income available to common shareholders (in Dollars)	$ 5,632	$ 17,422	$ 19,179	$ 33,328
Denominator– Denominator for basic earnings per share – weighted average shares outstanding	39,552	38,675	39,337	38,531
Effect of dilutive securities– Employee and director stock options and restricted share awards	1,029	869	1,109	1,074
Denominator for diluted earnings per share – adjusted weighted average shares outstanding and assumed conversions	40,581	39,544	40,446	39,605
Basic earnings per common share (in Dollars per share)	$ 0.14	$ 0.45	$ 0.49	$ 0.86
Diluted earnings per common share and common share equivalents (in Dollars per share)	$ 0.14	$ 0.44	$ 0.47	$ 0.84