Note 3 - Loans and Allowance for Loan Losses (Details) - Nonperforming Loans - USD ($)	Mar. 31, 2016	Dec. 31, 2015
Nonperforming Financial Instruments [Member]
Note 3 - Loans and Allowance for Loan Losses (Details) - Nonperforming Loans [Line Items]
Total nonperforming loans	$ 4,842,000	$ 5,444,000
Originated Loan [Member]
Note 3 - Loans and Allowance for Loan Losses (Details) - Nonperforming Loans [Line Items]
Loans past due 90 days or more still accruing interest	0	0
Originated Loan [Member] | Nonperforming Financial Instruments [Member]
Note 3 - Loans and Allowance for Loan Losses (Details) - Nonperforming Loans [Line Items]
Loans past due 90 days or more still accruing interest	0	0
Nonaccrual loans	1,702,000	1,954,000
Total nonperforming loans	1,702,000	1,954,000
Acquired Loan [Member]
Note 3 - Loans and Allowance for Loan Losses (Details) - Nonperforming Loans [Line Items]
Loans past due 90 days or more still accruing interest	0	5,000
Acquired Loan [Member] | Nonperforming Financial Instruments [Member]
Note 3 - Loans and Allowance for Loan Losses (Details) - Nonperforming Loans [Line Items]
Loans past due 90 days or more still accruing interest	0	5,000
Nonaccrual loans	3,140,000	3,485,000
Total nonperforming loans	3,140,000	3,490,000
Commercial Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Note 3 - Loans and Allowance for Loan Losses (Details) - Nonperforming Loans [Line Items]
Total nonperforming loans	2,399,000	2,646,000
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Nonperforming Financial Instruments [Member]
Note 3 - Loans and Allowance for Loan Losses (Details) - Nonperforming Loans [Line Items]
Total nonperforming loans	486,000	458,000
Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] | Nonperforming Financial Instruments [Member]
Note 3 - Loans and Allowance for Loan Losses (Details) - Nonperforming Loans [Line Items]
Total nonperforming loans	140,000	155,000
Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member] | Nonperforming Financial Instruments [Member]
Note 3 - Loans and Allowance for Loan Losses (Details) - Nonperforming Loans [Line Items]
Total nonperforming loans	1,641,000	1,797,000
Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member] | Nonperforming Financial Instruments [Member]
Note 3 - Loans and Allowance for Loan Losses (Details) - Nonperforming Loans [Line Items]
Total nonperforming loans	51,000	79,000
Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member] | Nonperforming Financial Instruments [Member]
Note 3 - Loans and Allowance for Loan Losses (Details) - Nonperforming Loans [Line Items]
Total nonperforming loans	81,000	157,000
Commercial Portfolio Segment [Member] | Originated Loan [Member]
Note 3 - Loans and Allowance for Loan Losses (Details) - Nonperforming Loans [Line Items]
Loans past due 90 days or more still accruing interest	0	0
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Commercial and Industrial [Member]
Note 3 - Loans and Allowance for Loan Losses (Details) - Nonperforming Loans [Line Items]
Loans past due 90 days or more still accruing interest	0	0
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]
Note 3 - Loans and Allowance for Loan Losses (Details) - Nonperforming Loans [Line Items]
Loans past due 90 days or more still accruing interest	0	0
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Owner Occupied Loan [Member]
Note 3 - Loans and Allowance for Loan Losses (Details) - Nonperforming Loans [Line Items]
Loans past due 90 days or more still accruing interest	0	0
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Non Owner Occupied Loan [Member]
Note 3 - Loans and Allowance for Loan Losses (Details) - Nonperforming Loans [Line Items]
Loans past due 90 days or more still accruing interest	0	0
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Multi Family and Residential Rental Loan [Member]
Note 3 - Loans and Allowance for Loan Losses (Details) - Nonperforming Loans [Line Items]
Loans past due 90 days or more still accruing interest	0	0
Commercial Portfolio Segment [Member] | Acquired Loan [Member]
Note 3 - Loans and Allowance for Loan Losses (Details) - Nonperforming Loans [Line Items]
Loans past due 90 days or more still accruing interest	0	0
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Commercial and Industrial [Member]
Note 3 - Loans and Allowance for Loan Losses (Details) - Nonperforming Loans [Line Items]
Loans past due 90 days or more still accruing interest	0	0
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]
Note 3 - Loans and Allowance for Loan Losses (Details) - Nonperforming Loans [Line Items]
Loans past due 90 days or more still accruing interest	0	0
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Owner Occupied Loan [Member]
Note 3 - Loans and Allowance for Loan Losses (Details) - Nonperforming Loans [Line Items]
Loans past due 90 days or more still accruing interest	0	0
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Non Owner Occupied Loan [Member]
Note 3 - Loans and Allowance for Loan Losses (Details) - Nonperforming Loans [Line Items]
Loans past due 90 days or more still accruing interest	0	0
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Multi Family and Residential Rental Loan [Member]
Note 3 - Loans and Allowance for Loan Losses (Details) - Nonperforming Loans [Line Items]
Loans past due 90 days or more still accruing interest	0	0
Retail Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Note 3 - Loans and Allowance for Loan Losses (Details) - Nonperforming Loans [Line Items]
Total nonperforming loans	2,443,000	2,798,000
Retail Portfolio Segment [Member] | Home Equity and Other [Member] | Nonperforming Financial Instruments [Member]
Note 3 - Loans and Allowance for Loan Losses (Details) - Nonperforming Loans [Line Items]
Total nonperforming loans	611,000	771,000
Retail Portfolio Segment [Member] | 1-4 Family Mortgages [Member] | Nonperforming Financial Instruments [Member]
Note 3 - Loans and Allowance for Loan Losses (Details) - Nonperforming Loans [Line Items]
Total nonperforming loans	1,832,000	2,027,000
Retail Portfolio Segment [Member] | Originated Loan [Member]
Note 3 - Loans and Allowance for Loan Losses (Details) - Nonperforming Loans [Line Items]
Loans past due 90 days or more still accruing interest	0	0
Retail Portfolio Segment [Member] | Originated Loan [Member] | Home Equity and Other [Member]
Note 3 - Loans and Allowance for Loan Losses (Details) - Nonperforming Loans [Line Items]
Loans past due 90 days or more still accruing interest	0	0
Retail Portfolio Segment [Member] | Originated Loan [Member] | 1-4 Family Mortgages [Member]
Note 3 - Loans and Allowance for Loan Losses (Details) - Nonperforming Loans [Line Items]
Loans past due 90 days or more still accruing interest	0	0
Retail Portfolio Segment [Member] | Acquired Loan [Member]
Note 3 - Loans and Allowance for Loan Losses (Details) - Nonperforming Loans [Line Items]
Loans past due 90 days or more still accruing interest	0	5,000
Retail Portfolio Segment [Member] | Acquired Loan [Member] | Home Equity and Other [Member]
Note 3 - Loans and Allowance for Loan Losses (Details) - Nonperforming Loans [Line Items]
Loans past due 90 days or more still accruing interest	0	5,000
Retail Portfolio Segment [Member] | Acquired Loan [Member] | 1-4 Family Mortgages [Member]
Note 3 - Loans and Allowance for Loan Losses (Details) - Nonperforming Loans [Line Items]
Loans past due 90 days or more still accruing interest	$ 0	$ 0