Note 8 - Reclassifications Out of Other Comprehensive Income - Items Reclassified to Net Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Realized gains on sales of securities held for sale during the period consider available for sale	$ 209		$ 214	$ 40
Tax expense related to realized gains on securities sold	71		73	14
	138		141	26
Tax expense related to realized gains on securities sold	434	$ 381	787	727
	$ 224	$ 863	$ 1,025	$ 1,639