Note 6 - Comprehensive Income (Details) - Amounts Reclassified Out of Accumulated Other Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Note 6 - Comprehensive Income (Details) - Amounts Reclassified Out of Accumulated Other Comprehensive Income [Line Items]
Other-than-temporary impairment losses on investment securities			$ 43
Tax expense	(604)	(540)	(1,827)	(2,059)
Total reclass out of accumulated other comprehensive income, net of tax	2,128	2,074	6,430	7,050
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			862
Other-than-temporary impairment losses on investment securities			(43)
			819
Tax expense			(278)
Total reclass out of accumulated other comprehensive income, net of tax			$ 541