Note 1 - Basis of Presentation (Details) - Earnings Per Share - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Net income available to common shareholders (in Dollars)		$ 21,598	$ 8,788	$ 50,325	$ 23,049
Average common shares outstanding		29,927	16,873	27,379	16,489
Average potential dilutive common shares		119	44	119	44
Average diluted common shares		30,046	16,917	27,498	16,533
Basic earnings per share (in Dollars per share)		$ 0.72	$ 0.52	$ 1.84	$ 1.40
Diluted earnings per share (1) (in Dollars per share)	[1]	$ 0.72	$ 0.52	$ 1.83	$ 1.39

[1] EPS are computed independently for each quarter and therefore the sum of each quarterly EPS may not equal the year-to-date EPS. As a result of the large stock issuances during 2015 as part of the Company's acquisitions, the computed independent quarterly average common shares outstanding and the computed year-to-date average common shares differ significantly. For purposes of calculating a roll-forward amount for year-to-date EPS, diluted EPS for the second quarter would require a computed amount of $0.74, producing a difference of $.02 from actual third quarter diluted EPS of $0.72. This difference is based on the direct result of the varying denominator for each period presented.