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, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share [Abstract]
Net income attributable to common stockholders	$ 32,289	$ 13,006	$ 45,016	$ 24,161
Undistributed income allocated to participating securities		(24)		(82)
Basic	32,289	12,982	45,016	24,079
Undistributed income allocated to participating securities		24		82
Undistributed income reallocated to participating securities		(24)		(82)
Diluted	$ 32,289	$ 12,982	$ 45,016	$ 24,079
Weighted-average common shares outstanding (in Shares)	26,253	26,286	26,139	26,176
Dilutive effect of stock options and restricted stock awards (in Shares)	18	8	10	25
Diluted (in Shares)	26,271	26,294	26,149	26,201
Basic (in Dollars per share)	$ 1.23	$ 0.49	$ 1.72	$ 0.92
Diluted (in Dollars per share)	$ 1.23	$ 0.49	$ 1.72	$ 0.92