Note 3 - Investment Securities (Detail) - Income Earned on Securities (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Non-taxable:
Total	$ 2,902	$ 3,275
Held-to-Maturity Securities [Member]
Taxable:
Taxable Investment Income	702	852
Non-taxable:
Non-taxable Investment Income	1,675	1,897
Available-for-sale Securities [Member]
Taxable:
Taxable Investment Income	519	526
Non-taxable:
Non-taxable Investment Income	$ 6