Note 17 - Components of Accumulated Other Comprehensive Income (Details) - Components of Accumulated Other Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at December 31	$ (5,672)	$ (16,964)	$ (2,738)
Unrealized holding	(1,064)	12,430	(16,091)
Reclassification adjustment, net of tax of	(21)	(1)	33
Net pension gain (loss) during period	(1,108)	(1,066)	1,898
Less amortization of prior service cost included in net periodic pension cost, net of tax of ($35/$39/$38)	(72)	(71)	(66)
Balance at December 31	(7,937)	(5,672)	(16,964)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at December 31	(1,582)	(14,011)	2,047
Unrealized holding	(1,064)	12,430	(16,091)
Reclassification adjustment, net of tax of	(21)	(1)	33
Balance at December 31	(2,667)	(1,582)	(14,011)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at December 31	(4,090)	(2,953)	(4,785)
Net pension gain (loss) during period	(1,108)	(1,066)	1,898
Less amortization of prior service cost included in net periodic pension cost, net of tax of ($35/$39/$38)	(72)	(71)	(66)
Balance at December 31	$ (5,270)	$ (4,090)	$ (2,953)