Note 2 - Securities (Details) - Credit Loss Component Of OTTI That Have Been Recognized In Income, Related To Debt Securities That The Company Does Not Intend To Sell (USD $) In Thousands, unless otherwise specified				3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 Not Previously Recognized [Member]	Sep. 30, 2013 Not Previously Recognized [Member]	Sep. 30, 2013 Previously Recognized With No Intent Or Requirement To Sell Before Recovery Of The Amortized Cost Basis [Member]	Sep. 30, 2013 Previously Recognized With No Intent Or Requirement To Sell Before Recovery Of The Amortized Cost Basis [Member]	Sep. 30, 2013 Other than Temporary Impairment, Credit Losses Recognized in Earnings, Categories of Investments [Member]	Sep. 30, 2013 Other than Temporary Impairment, Credit Losses Recognized in Earnings, Categories of Investments [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Credit losses at beginning of period	$ 1,758	$ 1,748	$ 1,716
Credit Loss Component Of OTTI				3	3	4	4	3	35
Credit losses at end of period	$ 1,758	$ 1,748	$ 1,716