Note 5 - Loans - Impaired Loans by Loan Class (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Recorded investment	$ 15,820	$ 18,794
Unpaid principle balance	19,521	22,653
Recorded investment with no related allowance recorded	11,207	12,641
Unpaid principal balance with no related allowance recorded	14,842	16,440
Recorded investment with related allowance recorded	4,613	6,153
Unpaid principal balance with related allowance recorded	4,679	6,213
Related allowance	1,090	1,461
Commercial Portfolio Segment [Member]
Recorded investment	3,113	3,525
Unpaid principle balance	4,071	4,395
Recorded investment with no related allowance recorded	1,351	1,573
Unpaid principal balance with no related allowance recorded	2,282	2,438
Recorded investment with related allowance recorded	1,762	1,952
Unpaid principal balance with related allowance recorded	1,789	1,957
Related allowance	602	641
Commercial Real Estate Portfolio Segment [Member]
Recorded investment	2,641	3,125
Unpaid principle balance	2,681	3,182
Related allowance	80	85
Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Recorded investment with no related allowance recorded	1,196	1,196
Unpaid principal balance with no related allowance recorded	1,196	1,196
Recorded investment with related allowance recorded	806	808
Unpaid principal balance with related allowance recorded	806	808
Related allowance	80	21
Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Recorded investment with no related allowance recorded	639	784
Unpaid principal balance with no related allowance recorded	679	841
Recorded investment with related allowance recorded		337
Unpaid principal balance with related allowance recorded		337
Related allowance		64
Residential Portfolio Segment [Member]
Recorded investment	10,028	11,894
Unpaid principle balance	12,731	14,820
Related allowance	395	721
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Recorded investment with no related allowance recorded	6,496	6,047
Unpaid principal balance with no related allowance recorded	8,231	7,685
Recorded investment with related allowance recorded	1,562	2,562
Unpaid principal balance with related allowance recorded	1,601	2,617
Related allowance	172	494
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Recorded investment with no related allowance recorded	653	1,914
Unpaid principal balance with no related allowance recorded	1,137	2,722
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Recorded investment with no related allowance recorded	872	917
Unpaid principal balance with no related allowance recorded	1,317	1,342
Recorded investment with related allowance recorded	445	454
Unpaid principal balance with related allowance recorded	445	454
Related allowance	223	227
Consumer Portfolio Segment [Member]
Recorded investment	38	250
Unpaid principle balance	38	256
Recorded investment with no related allowance recorded		210
Unpaid principal balance with no related allowance recorded		216
Recorded investment with related allowance recorded	38	40
Unpaid principal balance with related allowance recorded	38	40
Related allowance	$ 13	$ 14