Note 5 - Loans - Impaired Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Recorded investment with no related allowance recorded	$ 6,965	$ 7,626
Unpaid principal balance with no related allowance recorded	8,564	10,332
Recorded investment with related allowance recorded	4,047	5,521
Unpaid principal balance with related allowance recorded	4,209	5,663
Related allowance	1,237	1,169
Recorded investment	11,012	13,147
Unpaid principle balance	12,773	15,995
Commercial Portfolio Segment [Member]
Recorded investment with no related allowance recorded	51	672
Unpaid principal balance with no related allowance recorded	69	1,205
Recorded investment with related allowance recorded	2,132	2,482
Unpaid principal balance with related allowance recorded	2,256	2,540
Related allowance	748	690
Recorded investment	2,183	3,154
Unpaid principle balance	2,325	3,745
Commercial Real Estate Portfolio Segment [Member]
Related allowance	209	77
Recorded investment	1,343	1,403
Unpaid principle balance	1,343	1,468
Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Recorded investment with no related allowance recorded	548
Unpaid principal balance with no related allowance recorded	548
Recorded investment with related allowance recorded	795	803
Unpaid principal balance with related allowance recorded	795	803
Related allowance	209	77
Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Recorded investment with no related allowance recorded		600
Unpaid principal balance with no related allowance recorded		665
Residential Portfolio Segment [Member]
Related allowance	273	391
Recorded investment	7,463	8,554
Unpaid principle balance	9,082	10,746
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Recorded investment with no related allowance recorded	6,138	5,895
Unpaid principal balance with no related allowance recorded	7,676	7,516
Recorded investment with related allowance recorded	734	1,628
Unpaid principal balance with related allowance recorded	772	1,678
Related allowance	91	199
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Recorded investment with no related allowance recorded	185	414
Unpaid principal balance with no related allowance recorded	223	897
Recorded investment with related allowance recorded		192
Unpaid principal balance with related allowance recorded		226
Related allowance		2
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Recorded investment with no related allowance recorded	43	45
Unpaid principal balance with no related allowance recorded	48	49
Recorded investment with related allowance recorded	363	380
Unpaid principal balance with related allowance recorded	363	380
Related allowance	182	190
Consumer Portfolio Segment [Member]
Recorded investment with related allowance recorded	23	36
Unpaid principal balance with related allowance recorded	23	36
Related allowance	7	11
Recorded investment	23	36
Unpaid principle balance	$ 23	$ 36