Note 4 - Loans and Allowance for Loan Losses (Detail) - Recorded Investment of Residential and Consumer Loans (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Automobile Loans [Member] | Performing Loans [Member]
Consumer Loans	$ 41,424	$ 45,677
Automobile Loans [Member] | Nonperforming Loans [Member]
Consumer Loans	84	25
Automobile Loans [Member]
Consumer Loans	41,508	45,702
Home Equity Loans [Member] | Performing Loans [Member]
Consumer Loans	18,763	20,502
Home Equity Loans [Member] | Nonperforming Loans [Member]
Consumer Loans	96	5
Home Equity Loans [Member]
Consumer Loans	18,859	20,507
Other Consumer Loans [Member] | Performing Loans [Member]
Consumer Loans	39,777	40,947
Other Consumer Loans [Member] | Nonperforming Loans [Member]
Consumer Loans	46	7
Other Consumer Loans [Member]
Consumer Loans	39,823	40,954
Residential Real Estate Loans [Member] | Performing Loans [Member]
Consumer Loans	226,104	235,515
Residential Real Estate Loans [Member] | Nonperforming Loans [Member]
Consumer Loans	3,645	2,975
Residential Real Estate Loans [Member]
Consumer Loans	229,749	238,490
Consumer Loans [Member] | Performing Loans [Member]
Consumer Loans	326,068	342,641
Consumer Loans [Member] | Nonperforming Loans [Member]
Consumer Loans	3,871	3,012
Consumer Loans [Member]
Consumer Loans	$ 329,939	$ 345,653