Note 11 - Other Comprehensive Income - Components of Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Net unrealized gain on securities available-for-sale, before tax	$ 1,165	$ 5,963
Net unrealized gain on securities available-for-sale, tax	453	2,385
Unrealized gain on securities available for sale	712	3,578
Less: Reclassification adjustment for net gains included in net income, before tax	(505)	(624)
Less: Reclassification adjustment for net gains included in net income, tax	(183)	(250)
Less: Reclassification adjustment for net gains included in net income, net of tax	(322)	(374)
Total unrealized gain, before tax	660	5,339
Total unrealized gain, tax	270	2,135
Total unrealized gain, net of tax	390	3,204
Net unrealized gain on derivatives, before tax	1,752	(7,403)
Net unrealized gain on derivatives, tax	673	(2,961)
Unrealized gain (loss) on derivatives	1,079	(4,442)
Less: Reclassification adjustment for losses included in net income, before tax	(578)
Less: Reclassification adjustment for losses included in net income, tax	(209)
Less: Reclassification adjustment for losses included in net income, net of tax	(369)
Total unrealized gain (loss) on derivatives, before tax	1,174	(7,403)
Total unrealized gain (loss) on derivatives, tax	464	(2,961)
Total unrealized gain (loss) on derivatives, net of tax	710	(4,442)
Other Comprehensive Income, before tax	1,834	(2,064)
Other Comprehensive Income, tax	734	(826)
Other Comprehensive Income, net of tax	1,100	(1,238)
Reclassification adjustment for net gains included in net income	(322)	(374)
Reclassification adjustment for losses included in net income	$ (369)