Note 5 - Loans - Impaired Loans by Loan Class (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Recorded investment with no related allowance recorded	$ 12,641	$ 16,821
Unpaid principal balance with no related allowance recorded	16,440	21,118
Recorded investment with related allowance recorded	6,153	4,569
Unpaid principal balance with related allowance recorded	6,213	4,673
Related allowance	1,461	832
Recorded investment	18,794	21,390
Unpaid principle balance	22,653	25,791
Commercial Portfolio Segment [Member]
Recorded investment with no related allowance recorded	1,573	1,282
Unpaid principal balance with no related allowance recorded	2,438	1,519
Recorded investment with related allowance recorded	1,952	761
Unpaid principal balance with related allowance recorded	1,957	820
Related allowance	641	122
Recorded investment	3,525	2,043
Unpaid principle balance	4,395	2,339
Commercial Real Estate Portfolio Segment [Member]
Related allowance	85	97
Recorded investment	3,125	7,733
Unpaid principle balance	3,182	9,194
Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Recorded investment with no related allowance recorded	1,196	5,488
Unpaid principal balance with no related allowance recorded	1,196	6,226
Recorded investment with related allowance recorded	808	824
Unpaid principal balance with related allowance recorded	808	824
Related allowance	21	35
Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Recorded investment with no related allowance recorded	784	1,071
Unpaid principal balance with no related allowance recorded	841	1,794
Recorded investment with related allowance recorded	337	350
Unpaid principal balance with related allowance recorded	337	350
Related allowance	64	62
Residential Portfolio Segment [Member]
Related allowance	721	600
Recorded investment	11,894	11,582
Unpaid principle balance	14,820	14,226
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Recorded investment with no related allowance recorded	6,047	7,063
Unpaid principal balance with no related allowance recorded	7,685	8,662
Recorded investment with related allowance recorded	2,562	2,044
Unpaid principal balance with related allowance recorded	2,617	2,089
Related allowance	494	321
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Recorded investment with no related allowance recorded	1,914	1,775
Unpaid principal balance with no related allowance recorded	2,722	2,775
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Recorded investment with no related allowance recorded	917	142
Unpaid principal balance with no related allowance recorded	1,342	142
Recorded investment with related allowance recorded	454	558
Unpaid principal balance with related allowance recorded	454	558
Related allowance	227	279
Consumer Portfolio Segment [Member]
Recorded investment with no related allowance recorded	210
Unpaid principal balance with no related allowance recorded	216
Recorded investment with related allowance recorded	40	32
Unpaid principal balance with related allowance recorded	40	32
Related allowance	14	13
Recorded investment	250	32
Unpaid principle balance	$ 256	$ 32