Note 13 - Stockholders' Equity and Earnings Per Share (Details) - Accumulated Other Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Beginning balance, loss, net of tax
Securities available-for-sale	$ (3,172)	$ (29,729)
Cash flow hedge derivatives	(2,397)
Total	(5,569)	(29,729)
Net unrealized (losses)/gains arising during the period
Securities available-for-sale	(4,200)	30,468	$ (14,335)
Cash flow hedge derivatives	(598)	(2,397)
Total	(8,279)	48,437
Total	(3,481)	20,366
Total	(4,798)	28,071
Reclassification adjustment for net losses/(gains) included in net income
Securities available-for-sale	(1,941)	3,911	15,859
Total	3,349	(6,748)
Total	1,408	(2,837)
Total	1,941	(3,911)
Total other comprehensive (loss)/income
Total	(4,930)	41,689
Total	(2,073)	17,529
Total	(2,857)	24,160	(30,194)
Ending balance, loss, net of tax
Securities available-for sale	(5,431)	(3,172)	(29,729)
Cash flow hedge derivatives	(2,995)	(2,397)
Total	(8,426)	(5,569)	$ (29,729)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Net unrealized (losses)/gains arising during the period
Securities available-for-sale	(7,247)	52,573
Securities available-for-sale	(3,047)	22,105
Securities available-for-sale	(4,200)	30,468
Reclassification adjustment for net losses/(gains) included in net income
Securities available-for-sale	3,349	(6,748)
Securities available-for-sale	1,408	(2,837)
Securities available-for-sale	1,941	(3,911)
Total other comprehensive (loss)/income
Securities available-for-sale	(3,898)	45,825
Securities available-for-sale	(1,639)	19,268
Securities available-for-sale	(2,259)	26,557
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Net unrealized (losses)/gains arising during the period
Cash flow hedge derivatives	(1,032)	(4,136)
Cash flow hedge derivatives	(434)	(1,739)
Cash flow hedge derivatives	(598)	(2,397)
Total other comprehensive (loss)/income
Cash flow hedge derivatives	(1,032)	(4,136)
Cash flow hedge derivatives	(434)	(1,739)
Cash flow hedge derivatives	$ (598)	$ (2,397)