Note 4 - Loans - Impaired Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Recorded investment with no related allowance recorded	$ 9,727	$ 12,641
Unpaid principal balance with no related allowance recorded	13,398	16,440
Recorded investment with related allowance recorded	4,450	6,153
Unpaid principal balance with related allowance recorded	4,533	6,213
Related allowance	918	1,461
Recorded investment	14,177	18,794
Unpaid principle balance	17,931	22,653
Commercial Portfolio Segment [Member]
Recorded investment with no related allowance recorded	1,322	1,573
Unpaid principal balance with no related allowance recorded	2,170	2,438
Recorded investment with related allowance recorded	1,658	1,952
Unpaid principal balance with related allowance recorded	1,701	1,957
Related allowance	453	641
Recorded investment	2,980	3,525
Unpaid principle balance	3,871	4,395
Commercial Real Estate Portfolio Segment [Member]
Related allowance	79	85
Recorded investment	1,422	3,125
Unpaid principle balance	1,476	3,182
Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Recorded investment with no related allowance recorded		1,196
Unpaid principal balance with no related allowance recorded		1,196
Recorded investment with related allowance recorded	805	808
Unpaid principal balance with related allowance recorded	805	808
Related allowance	79	21
Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Recorded investment with no related allowance recorded	617	784
Unpaid principal balance with no related allowance recorded	671	841
Recorded investment with related allowance recorded		337
Unpaid principal balance with related allowance recorded		337
Related allowance		64
Residential Portfolio Segment [Member]
Related allowance	374	721
Recorded investment	9,738	11,894
Unpaid principle balance	12,547	14,820
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Recorded investment with no related allowance recorded	6,347	6,047
Unpaid principal balance with no related allowance recorded	8,111	7,685
Recorded investment with related allowance recorded	1,509	2,562
Unpaid principal balance with related allowance recorded	1,549	2,617
Related allowance	154	494
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Recorded investment with no related allowance recorded	626	1,914
Unpaid principal balance with no related allowance recorded	1,130	2,722
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Recorded investment with no related allowance recorded	815	917
Unpaid principal balance with no related allowance recorded	1,316	1,342
Recorded investment with related allowance recorded	441	454
Unpaid principal balance with related allowance recorded	441	454
Related allowance	220	227
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	37	40
Unpaid principal balance with related allowance recorded	37	40
Related allowance	12	14
Recorded investment	37	250
Unpaid principle balance	$ 37	$ 256