Note 1 - General Information (Details) - Earnings Per Share (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
Earnings Per Share [Abstract]
Net income attributable to common stockholders	$ 24,344	$ 32,289	$ 55,100	$ 45,016
Basic	24,344	32,289	55,100	45,016
Diluted	$ 24,344	$ 32,289	$ 55,100	$ 45,016
Basic
Weighted-average common shares outstanding (in Shares)	26,390	26,253	26,389	26,139
Dilutive effect of stock options and restricted stock awards (in Shares)		18	5	10
Diluted (in Shares)	26,390	26,271	26,394	26,149
Income per common share:
Basic (in Dollars per share)	$ 0.92	$ 1.23	$ 2.09	$ 1.72
Diluted (in Dollars per share)	$ 0.92	$ 1.23	$ 2.09	$ 1.72