Note 7 - Investment Securities (Details) - Credit-Related Other-Than-Temporary Impairment (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012
Credit-Related Other-Than-Temporary Impairment [Abstract]
Balance, beginning of period	$ 1,271	$ 1,271	$ 1,271	$ 1,271	$ 1,271	$ 1,271
Balance, end of period	$ 1,271	$ 1,271	$ 1,271	$ 1,271	$ 1,271	$ 1,271