Note 4 - Loans and Allowance for Loan Losses (Details) - Loans Modified as Troubled Debt Restructurings	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)
Originated Loan [Member]
Financing Receivable, Modifications [Line Items]
Loans modified, number of contracts	4	1	10	3
Loans modified, pre-modification recorded principal balance	$ 1,308,000	$ 996,000	$ 1,876,000	$ 1,156,000
Loans modified, post-modification recorded principal balance	$ 1,308,000	$ 996,000	$ 1,901,000	$ 1,156,000
Acquired Loan [Member]
Financing Receivable, Modifications [Line Items]
Loans modified, number of contracts	10	0	12	0
Loans modified, pre-modification recorded principal balance	$ 1,133,000	$ 0	$ 1,183,000	$ 0
Loans modified, post-modification recorded principal balance	$ 1,133,000	$ 0	$ 1,183,000	$ 0
Commercial Portfolio Segment [Member] | Originated Loan [Member]
Financing Receivable, Modifications [Line Items]
Loans modified, number of contracts	4	1		3
Loans modified, pre-modification recorded principal balance	$ 1,308,000	$ 996,000		$ 1,156,000
Loans modified, post-modification recorded principal balance	$ 1,308,000	$ 996,000		$ 1,156,000
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Loans modified, number of contracts	4	0	10	1
Loans modified, pre-modification recorded principal balance	$ 1,308,000	$ 0	$ 1,876,000	$ 14,000
Loans modified, post-modification recorded principal balance	$ 1,308,000	$ 0	$ 1,901,000	$ 14,000
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]
Financing Receivable, Modifications [Line Items]
Loans modified, number of contracts	0	0	0	0
Loans modified, pre-modification recorded principal balance	$ 0	$ 0	$ 0	$ 0
Loans modified, post-modification recorded principal balance	$ 0	$ 0	$ 0	$ 0
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Owner Occupied Loan [Member]
Financing Receivable, Modifications [Line Items]
Loans modified, number of contracts	0	1	0	1
Loans modified, pre-modification recorded principal balance	$ 0	$ 996,000	$ 0	$ 996,000
Loans modified, post-modification recorded principal balance	$ 0	$ 996,000	$ 0	$ 996,000
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Non Owner Occupied Loan [Member]
Financing Receivable, Modifications [Line Items]
Loans modified, number of contracts	0	0	0	1
Loans modified, pre-modification recorded principal balance	$ 0	$ 0	$ 0	$ 146,000
Loans modified, post-modification recorded principal balance	$ 0	$ 0	$ 0	$ 146,000
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Multi Family and Residential Rental Loan [Member]
Financing Receivable, Modifications [Line Items]
Loans modified, number of contracts	0	0	0	0
Loans modified, pre-modification recorded principal balance	$ 0	$ 0	$ 0	$ 0
Loans modified, post-modification recorded principal balance	$ 0	$ 0	$ 0	$ 0
Commercial Portfolio Segment [Member] | Acquired Loan [Member]
Financing Receivable, Modifications [Line Items]
Loans modified, number of contracts	9	0	11	0
Loans modified, pre-modification recorded principal balance	$ 972,000	$ 0	$ 1,022,000	$ 0
Loans modified, post-modification recorded principal balance	$ 972,000	$ 0	$ 1,022,000	$ 0
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Loans modified, number of contracts	2	0	2	0
Loans modified, pre-modification recorded principal balance	$ 286,000	$ 0	$ 286,000	$ 0
Loans modified, post-modification recorded principal balance	$ 286,000	$ 0	$ 286,000	$ 0
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]
Financing Receivable, Modifications [Line Items]
Loans modified, number of contracts	0	0	0	0
Loans modified, pre-modification recorded principal balance	$ 0	$ 0	$ 0	$ 0
Loans modified, post-modification recorded principal balance	$ 0	$ 0	$ 0	$ 0
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Owner Occupied Loan [Member]
Financing Receivable, Modifications [Line Items]
Loans modified, number of contracts	3	0	5	0
Loans modified, pre-modification recorded principal balance	$ 119,000	$ 0	$ 169,000	$ 0
Loans modified, post-modification recorded principal balance	$ 119,000	$ 0	$ 169,000	$ 0
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Non Owner Occupied Loan [Member]
Financing Receivable, Modifications [Line Items]
Loans modified, number of contracts	1	0	1	0
Loans modified, pre-modification recorded principal balance	$ 302,000	$ 0	$ 302,000	$ 0
Loans modified, post-modification recorded principal balance	$ 302,000	$ 0	$ 302,000	$ 0
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Multi Family and Residential Rental Loan [Member]
Financing Receivable, Modifications [Line Items]
Loans modified, number of contracts	3	0	3	0
Loans modified, pre-modification recorded principal balance	$ 265,000	$ 0	$ 265,000	$ 0
Loans modified, post-modification recorded principal balance	$ 265,000	$ 0	$ 265,000	$ 0
Retail Portfolio Segment [Member] | Originated Loan [Member]
Financing Receivable, Modifications [Line Items]
Loans modified, number of contracts	0	0	0	0
Loans modified, pre-modification recorded principal balance	$ 0	$ 0	$ 0	$ 0
Loans modified, post-modification recorded principal balance	$ 0	$ 0	$ 0	$ 0
Retail Portfolio Segment [Member] | Originated Loan [Member] | Home Equity and Other [Member]
Financing Receivable, Modifications [Line Items]
Loans modified, number of contracts	0	0	0	0
Loans modified, pre-modification recorded principal balance	$ 0	$ 0	$ 0	$ 0
Loans modified, post-modification recorded principal balance	$ 0	$ 0	$ 0	$ 0
Retail Portfolio Segment [Member] | Originated Loan [Member] | 1-4 Family Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Loans modified, number of contracts	0	0	0	0
Loans modified, pre-modification recorded principal balance	$ 0	$ 0	$ 0	$ 0
Loans modified, post-modification recorded principal balance	$ 0	$ 0	$ 0	$ 0
Retail Portfolio Segment [Member] | Acquired Loan [Member]
Financing Receivable, Modifications [Line Items]
Loans modified, number of contracts	1	0	1	0
Loans modified, pre-modification recorded principal balance	$ 161,000	$ 0	$ 161,000	$ 0
Loans modified, post-modification recorded principal balance	$ 161,000	$ 0	$ 161,000	$ 0
Retail Portfolio Segment [Member] | Acquired Loan [Member] | Home Equity and Other [Member]
Financing Receivable, Modifications [Line Items]
Loans modified, number of contracts	1	0	1	0
Loans modified, pre-modification recorded principal balance	$ 161,000	$ 0	$ 161,000	$ 0
Loans modified, post-modification recorded principal balance	$ 161,000	$ 0	$ 161,000	$ 0
Retail Portfolio Segment [Member] | Acquired Loan [Member] | 1-4 Family Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Loans modified, number of contracts	0	0	0	0
Loans modified, pre-modification recorded principal balance	$ 0	$ 0	$ 0	$ 0
Loans modified, post-modification recorded principal balance	$ 0	$ 0	$ 0	$ 0