Note 17 - Components of Accumulated Other Comprehensive Income (Details) - Components of Accumulated Other Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ (5,672)	$ (16,964)	$ (2,738)	$ (1,321)
Unrealized holding gain (loss) on available for sale securities net of tax	12,430	(16,091)	(569)
Reclassification adjustment, net of tax	(1)	33	(30)
Net pension gain (loss) arising during the period, net of tax	(1,066)	1,898	(752)
Less amortization of prior service cost included in net periodic pension cost, net of tax	(71)	(66)	(66)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(1,582)	(14,011)	2,047	2,646
Unrealized holding gain (loss) on available for sale securities net of tax	12,430	(16,091)	(569)
Reclassification adjustment, net of tax	(1)	33	(30)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(4,090)	(2,953)	(4,785)	(3,967)
Net pension gain (loss) arising during the period, net of tax	(1,066)	1,898	(752)
Less amortization of prior service cost included in net periodic pension cost, net of tax	$ (71)	$ (66)	$ (66)