Note 6 - Comprehensive Income (Details) - Amounts Reclassified Out of Accumulated Other Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Note 6 - Comprehensive Income (Details) - Amounts Reclassified Out of Accumulated Other Comprehensive Income [Line Items]
Other-than-temporary losses on investment securities			$ 43	$ 0
Tax effect	(490)	(769)	(1,223)	(1,519)
Total reclass out of accumulated other comprehensive income, net of tax	1,894	2,505	4,302	4,976
Amount Reclassified From Accumulated Other Comprehensive Income [Member]
Note 6 - Comprehensive Income (Details) - Amounts Reclassified Out of Accumulated Other Comprehensive Income [Line Items]
Unrealized net holding gains on available-for-sale securities			559
Other-than-temporary losses on investment securities			(43)
			516
Tax effect			(176)
Total reclass out of accumulated other comprehensive income, net of tax			$ 340