Note 1 - Summary of Significant Accounting Policies (Details) - Earnings Per Share - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share [Abstract]
Net income available to common shareholders (in Dollars)	$ 74,107	$ 35,688	$ 23,231
Average common shares outstanding	28,084	16,879	16,339
Average potential dilutive common shares	126	43	13
Average diluted common shares	28,210	16,922	16,352
Basic earnings per share (in Dollars per share)	$ 2.64	$ 2.11	$ 1.42
Diluted earnings per share (in Dollars per share)	$ 2.63	$ 2.11	$ 1.42