Note 3 - Investment Securities (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]
Available-for-sale Securities Pledged as Collateral	$ 568,000,000		$ 568,000,000		$ 587,900,000
Securities Sold under Agreements to Repurchase	81,300,000		81,300,000		102,800,000
Available-for-sale Securities, Gross Realized Gains	38,000	0
Available-for-sale Securities, Gross Realized Losses			$ 0	$ 193,000