Note 4 - Loans and Allowance for Loan Losses (Detail) - Recorded Investment of Residential and Consumer Loans (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Automobile Loans [Member] | Performing Loans [Member]
Consumer Loans	$ 40,049	$ 41,153
Automobile Loans [Member] | Nonperforming Loans [Member]
Consumer Loans	24	15
Automobile Loans [Member]
Consumer Loans	40,073	41,168
Home Equity Loans [Member] | Performing Loans [Member]
Consumer Loans	18,051	18,270
Home Equity Loans [Member] | Nonperforming Loans [Member]
Consumer Loans	100	62
Home Equity Loans [Member]
Consumer Loans	18,151	18,332
Other Consumer Loans [Member] | Performing Loans [Member]
Consumer Loans	39,043	40,510
Other Consumer Loans [Member] | Nonperforming Loans [Member]
Consumer Loans	5	7
Other Consumer Loans [Member]
Consumer Loans	39,048	40,517
Residential Real Estate Loans [Member] | Performing Loans [Member]
Consumer Loans	220,359	223,148
Residential Real Estate Loans [Member] | Nonperforming Loans [Member]
Consumer Loans	3,193	2,874
Residential Real Estate Loans [Member]
Consumer Loans	223,552	226,022
Consumer Loans [Member] | Performing Loans [Member]
Consumer Loans	317,502	323,081
Consumer Loans [Member] | Nonperforming Loans [Member]
Consumer Loans	3,322	2,958
Consumer Loans [Member]
Consumer Loans	$ 320,824	$ 326,039