Note 7 - Securities Sold Under Agreements to Repurchase (Details) - Securities Sold Under Agreement To Repurchase (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Securities Sold Under Agreement To Repurchase [Abstract]
Outstanding balance at end of period	$ 142,869,000	$ 69,305,000
Average interest rate at end of period	0.10%	0.12%
Average daily balance during the period	93,855,000	65,939,000
Average interest rate during the period	0.12%	0.12%
Maximum daily balance during the period	$ 148,700,000	$ 78,960,000