Note 3 - Investment Securities (Detail) - Income Earned on Securities (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Non-taxable
Total	$ 3,027	$ 3,539	$ 9,615	$ 11,015
Held-to-Maturity Securities [Member]
Taxable
Taxable Investment Income	707	942	2,389	3,243
Non-taxable
Held-to-maturity	1,806	1,951	5,602	5,921
Available-for-sale Securities [Member]
Taxable
Taxable Investment Income	$ 514	$ 646	$ 1,624	$ 1,851