Note 2 - Securities (Detail) - 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
	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2011	Sep. 30, 2012 No Intent to Sell and No Requirement to Sell [Member]	Sep. 30, 2012 No Intent to Sell and No Requirement to Sell [Member]	Sep. 30, 2012 Other than Temporary Impairment, Credit Losses Recognized in Earnings, Categories of Investments [Member]	Sep. 30, 2012 Other than Temporary Impairment, Credit Losses Recognized in Earnings, Categories of Investments [Member]
Credit losses at beginning of period	$ 1,679	$ 1,672	$ 1,595
OTTI Additions				5	51	2	33
Credit losses at end of period	$ 1,679	$ 1,672	$ 1,595