Note 4 - Loans and Allowance for Credit Losses (Details) - Troubled Debt Restructurings (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Financing Receivable, Modifications [Line Items]
Number of Contracts	10	7
Pre-Modification Carrying Value	$ 6,237	$ 8,286
Period-End Carrying Value	5,907	7,538
Period-End Individual Impairment Allowance	259	394
Commercial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	6	4
Pre-Modification Carrying Value	3,465	1,991
Period-End Carrying Value	3,109	1,689
Period-End Individual Impairment Allowance	259
Commercial Real Estate Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	3	3
Pre-Modification Carrying Value	2,754	6,295
Period-End Carrying Value	2,787	5,849
Period-End Individual Impairment Allowance		394
Consumer Installment And Other [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	1
Pre-Modification Carrying Value	18
Period-End Carrying Value	$ 11