Note 1 - Basis of Presentation (Details) - Earnings Per Share - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share [Abstract]
Net income available to common shareholders (in Dollars)		$ 20,018	$ 9,908	$ 28,727	$ 14,261
Average common shares outstanding		29,867	16,318	26,084	16,294
Average potential dilutive common shares		120	43	120	43
Average diluted common shares		29,987	16,361	26,204	16,337
Basic earnings per share (in Dollars per share)		$ 0.67	$ 0.61	$ 1.10	$ 0.88
Diluted earnings per share (1) (in Dollars per share)	[1]	$ 0.67	$ 0.60	$ 1.10	$ 0.87

[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 $0.71, producing a difference of $.04 from actual second quarter diluted EPS of $0.67. This difference is based on the direct result of the varying denominator for each period presented.