Note 3 - Investment Securities (Details) - Income Earned on Securities (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Non-taxable:
Total	$ 3,019	$ 3,313	$ 5,921	$ 6,588
Held-to-Maturity Securities [Member]
Taxable:
Taxable Investment Income	760	829	1,463	1,681
Non-taxable:
Non-taxable Investment Income	1,709	1,899	3,384	3,796
Available-for-sale Securities [Member]
Taxable:
Taxable Investment Income	546	585	1,065	1,111
Non-taxable:
Non-taxable Investment Income	$ 4		$ 9