Note 4 - Loans and Allowance for Credit Losses (Details) - Troubled Debt Restructurings (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Financing Receivable, Modifications [Line Items]
Number of Contracts	6	6
Pre-Modification Carrying Value	$ 5,510	$ 8,701
Period-End Carrying Value	5,271	8,707
Period-End Individual Impairment Allowance	262	786
Commercial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	3	3
Pre-Modification Carrying Value	3,201	1,318
Period-End Carrying Value	2,938	1,172
Period-End Individual Impairment Allowance	262	786
Commercial Real Estate Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	2	3
Pre-Modification Carrying Value	2,291	7,383
Period-End Carrying Value	2,316	7,535
Consumer Installment And Other [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	1
Pre-Modification Carrying Value	18
Period-End Carrying Value	$ 17