Note 9 - Components of Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Balance			$ (2,666)	$ (1,582)
Unrealized holding gain (loss) on available for sale securities net of tax			4,031	(3,213)
Reclassification adjustment, net of tax			(34)	(2)
Balance	$ 1,331	$ (4,797)	1,331	(4,797)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance			(5,270)	(4,090)
Balance	(5,270)	(4,090)	(5,270)	(4,090)
Balance			(7,936)	(5,672)
Unrealized holding gain (loss) on available for sale securities net of tax	684	(5,665)	4,031	(3,213)
Reclassification adjustment, net of tax	(30)	(3)	(34)	(2)
Balance	$ (3,939)	$ (8,887)	$ (3,939)	$ (8,887)