Note 9 - Components of Accumulated Other Comprehensive Loss (Details) - Components of Accumulated Other Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ (3,219)	$ (13,843)	$ (5,672)	$ (16,964)
Unrealized holding gain (loss) on available for sale securities net of tax	2,452	3,121
Reclassification adjustment, net of tax	1
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	871	(10,890)	(1,582)	(14,011)
Unrealized holding gain (loss) on available for sale securities net of tax	2,452	3,121
Reclassification adjustment, net of tax	1
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ (4,090)	$ (2,953)	$ (4,090)	$ (2,953)