Note 4 - Loans and Allowance for Loan Losses (Detail) - Recorded Investment of Nonaccrual Loans and Loans Past Due 90 days (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Loans past due 90 days and still accruing	$ 396	$ 359
Nonaccrual	4,093	3,626
Residential Real Estate Loans [Member]
Loans past due 90 days and still accruing	287	341
Nonaccrual	2,906	2,533
Commercial Real Estate Owner Occupied [Member]
Nonaccrual	1,115	675
Commercial Real Estate Nonowner Occupied [Member]
Nonaccrual	52	352
Automobile Loans [Member]
Loans past due 90 days and still accruing	9	11
Nonaccrual	15	4
Home Equity Loans [Member]
Loans past due 90 days and still accruing	100
Nonaccrual		62
Other Consumer Loans [Member]
Loans past due 90 days and still accruing		7
Nonaccrual	$ 5