Note 1 - General Information (Details) - Earnings Per Share (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income:
Net income attributable to common stockholders	$ 14,199	$ 9,856	$ 30,756	$ 12,727
Basic	14,199	9,856	30,756	12,727
Diluted	$ 14,199	$ 9,856	$ 30,756	$ 12,727
Shares:
Weighted-average common shares outstanding	26,425	26,120	26,389	26,082
Dilutive effect of stock options and restricted stock awards	8	8	7	7
Diluted	26,433	26,128	26,396	26,089
Income per common share:
Basic	$ 0.54	$ 0.38	$ 1.17	$ 0.49
Diluted	$ 0.54	$ 0.38	$ 1.17	$ 0.49