Note 17 - Components of Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Balance	$ (7,937)	$ (5,672)	$ (16,964)
Unrealized holding loss on available for sale securities, net of tax	(800)	(1,064)	12,430
Reclassification adjustment, net of tax	(121)	(21)	(1)
Net pension loss arising during the period, net of tax	271	(1,108)	(1,066)
Less amortization of prior service cost included in net periodic pension cost, net of tax	(72)	(72)	(71)
Balance	(8,659)	(7,937)	(5,672)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Balance	(2,667)	(1,582)	(14,011)
Unrealized holding loss on available for sale securities, net of tax	(800)	(1,064)	12,430
Reclassification adjustment, net of tax	(121)	(21)	(1)
Net pension loss arising during the period, net of tax	0	0	0
Less amortization of prior service cost included in net periodic pension cost, net of tax	0	0	0
Balance	(3,588)	(2,667)	(1,582)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(5,270)	(4,090)	(2,953)
Unrealized holding loss on available for sale securities, net of tax	0	0	0
Reclassification adjustment, net of tax	0	0	0
Net pension loss arising during the period, net of tax	271	(1,108)	(1,066)
Less amortization of prior service cost included in net periodic pension cost, net of tax	(72)	(72)	(71)
Balance	$ (5,071)	$ (5,270)	$ (4,090)