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	6 Months Ended
	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Jun. 30, 2013 Other than Temporary Impairment, Credit Losses Recognized in Earnings, Categories of Investments [Member]	Jun. 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	$ 1,748	$ 1,732	$ 1,716
Transfers from accumulated other comprehensive income (loss) to OTTI related to credit losses				16	32
Credit losses at end of period	$ 1,748	$ 1,732	$ 1,716