Note 6 - Amounts Reclassified Out of Accumulated Other Comprehensive Income (Details) - USD ($)	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]
Unrealized net holding gains on available-for-sale securities	$ 137,000	$ 214,000	$ 526,000	$ 717,000
Other-than-temporary impairment losses on investment securities	(122,000)		(192,000)
	15,000	214,000	334,000	717,000
Tax effect	(5,000)	(73,000)	(114,000)	(244,000)
Total reclass out of accumulated other comprehensive income, net of tax	10,000	141,000	220,000	473,000
	2,800,000	2,517,000	5,853,000	5,354,000
Tax effect	(702,000)	(583,000)	(1,490,000)	(1,284,000)
Total reclass out of accumulated other comprehensive income, net of tax	$ 2,098,000	$ 1,934,000	$ 4,363,000	$ 4,070,000