Note 3 - Investment Securities (Details) - Income Earned on Securities (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Non-taxable:
Total	$ 3,428	$ 3,027	$ 9,349	$ 9,615
Held-to-Maturity Securities [Member]
Taxable:
Taxable Investment Income	818	707	2,281	2,389
Non-taxable:
Non-taxable Investment Income	2,066	1,806	5,450	5,602
Available-for-sale Securities [Member]
Taxable:
Taxable Investment Income	540	514	1,605	1,624
Non-taxable:
Non-taxable Investment Income	$ 4		$ 13