Note 3 - Loans and Allowance for Loan Losses (Details) - Loans Modified as Troubled Debt Restructurings	3 Months Ended
	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)
Originated Loan [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	1	6
Pre-Modification Recorded Principal Balance	$ 20,000	$ 568,000
Post-Modification Recorded Principal Balance	$ 20,000	$ 593,000
Acquired Loan [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	2	3
Pre-Modification Recorded Principal Balance	$ 45,000	$ 129,000
Post-Modification Recorded Principal Balance	$ 45,000	$ 129,000
Commercial Portfolio Segment [Member] | Originated Loan [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	1	6
Pre-Modification Recorded Principal Balance	$ 20,000	$ 568,000
Post-Modification Recorded Principal Balance	$ 20,000	$ 593,000
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	1	6
Pre-Modification Recorded Principal Balance	$ 20,000	$ 568,000
Post-Modification Recorded Principal Balance	$ 20,000	$ 593,000
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	0
Pre-Modification Recorded Principal Balance	$ 0	$ 0
Post-Modification Recorded Principal Balance	$ 0	$ 0
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Owner Occupied Loan [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	0
Pre-Modification Recorded Principal Balance	$ 0	$ 0
Post-Modification Recorded Principal Balance	$ 0	$ 0
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Non Owner Occupied Loan [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	0
Pre-Modification Recorded Principal Balance	$ 0	$ 0
Post-Modification Recorded Principal Balance	$ 0	$ 0
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Multi Family and Residential Rental Loan [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	0
Pre-Modification Recorded Principal Balance	$ 0	$ 0
Post-Modification Recorded Principal Balance	$ 0	$ 0
Commercial Portfolio Segment [Member] | Acquired Loan [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	3
Pre-Modification Recorded Principal Balance	$ 0	$ 129,000
Post-Modification Recorded Principal Balance	$ 0	$ 129,000
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	1
Pre-Modification Recorded Principal Balance	$ 0	$ 79,000
Post-Modification Recorded Principal Balance	$ 0	$ 79,000
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	0
Pre-Modification Recorded Principal Balance	$ 0	$ 0
Post-Modification Recorded Principal Balance	$ 0	$ 0
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Owner Occupied Loan [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	2
Pre-Modification Recorded Principal Balance	$ 0	$ 50,000
Post-Modification Recorded Principal Balance	$ 0	$ 50,000
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Non Owner Occupied Loan [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	0
Pre-Modification Recorded Principal Balance	$ 0	$ 0
Post-Modification Recorded Principal Balance	$ 0	$ 0
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Multi Family and Residential Rental Loan [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	0
Pre-Modification Recorded Principal Balance	$ 0	$ 0
Post-Modification Recorded Principal Balance	$ 0	$ 0
Retail Portfolio Segment [Member] | Originated Loan [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	0
Pre-Modification Recorded Principal Balance	$ 0	$ 0
Post-Modification Recorded Principal Balance	$ 0	$ 0
Retail Portfolio Segment [Member] | Originated Loan [Member] | Home Equity and Other [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	0
Pre-Modification Recorded Principal Balance	$ 0	$ 0
Post-Modification Recorded Principal Balance	$ 0	$ 0
Retail Portfolio Segment [Member] | Originated Loan [Member] | 1-4 Family Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	0
Pre-Modification Recorded Principal Balance	$ 0	$ 0
Post-Modification Recorded Principal Balance	$ 0	$ 0
Retail Portfolio Segment [Member] | Acquired Loan [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	2	0
Pre-Modification Recorded Principal Balance	$ 45,000	$ 0
Post-Modification Recorded Principal Balance	$ 45,000	$ 0
Retail Portfolio Segment [Member] | Acquired Loan [Member] | Home Equity and Other [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	1	0
Pre-Modification Recorded Principal Balance	$ 26,000	$ 0
Post-Modification Recorded Principal Balance	$ 26,000	$ 0
Retail Portfolio Segment [Member] | Acquired Loan [Member] | 1-4 Family Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	1	0
Pre-Modification Recorded Principal Balance	$ 19,000	$ 0
Post-Modification Recorded Principal Balance	$ 19,000	$ 0