Note 8 - Fair Value Measurements (Details) - Assets Measured At Fair Value Based On Significant Unobservable Information (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Beginning of Period [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, beginning of period	$ 230	$ 226
Balance, end of period		230
Realized gains included in other noninterest income	5	4
End of Period [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, end of period	$ 235	$ 230