Note 17 - Components of Accumulated Other Comprehensive Income (Details) - Components of Accumulated Other Comprehensive Income (Loss) (Parentheticals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrealized holding gain (loss) on available for sale securities, tax	$ (571)	$ 6,693	$ (8,665)
Reclassification adjustment, tax	(12)	(1)	19
pension gain (loss), tax	(597)	(574)	1,022
Less amortization of prior service cost included in net periodic pension cost, tax	$ (38)	$ (39)	$ (35)