Note 17 - Components of Accumulated Other Comprehensive Income (Details) - Reclassifications Out of Accumulated Other Comprehensive Income (Loss) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reclassification out of unrealized gains and losses on available-for-sale securities:
Income tax expense (benefit)		$ 12	$ 1	$ (19)
Realized (gains) losses on available-for-sale securities, net of tax reclassified out of accumulated other comprehensive income		(21)	(1)	33
Amortization of defined benefit pension items:
Income tax expense (benefit)		38	39	35
Amortization of defined benefit pension items net of tax reclassified out of accumulate other comprehensive income		(72)	(71)	(66)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification out of unrealized gains and losses on available-for-sale securities:
Realized securities (gains) losses, net		(33)	(2)	52
Income tax expense (benefit)		(12)	(1)	19
Realized (gains) losses on available-for-sale securities, net of tax reclassified out of accumulated other comprehensive income		(21)	(1)	33
Amortization of defined benefit pension items:
Prior service costs(1)	[1]	(110)	(110)	(101)
Income tax expense (benefit)		(38)	(39)	(35)
Amortization of defined benefit pension items net of tax reclassified out of accumulate other comprehensive income		$ (72)	$ (71)	$ (66)

[1] This accumulated other comprehensive income (loss) component is included in the computation of net periodic benefit cost. (For additional information, see Note 8, "Employee Benefit Plans.")