Note 4 - Loans and Allowance for Loan Losses (Detail) - Post-Modification Balances of TDR Loan Modifications (Performing to Modified Terms [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2012
Owner-occupied
Pre-Modification Recorded Investment	$ 4,994
Post-Modification Recorded Investment	4,942
Owner Occupied [Member]
Owner-occupied
Pre-Modification Recorded Investment	4,308
Post-Modification Recorded Investment	4,266
Nonowner Occupied [Member]
Owner-occupied
Pre-Modification Recorded Investment	686
Post-Modification Recorded Investment	$ 676