Note 4 - Loans and Allowance for Loan Losses - Loans Individually Evaluated for Impairment (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Allowance for Loan Losses Allocated	$ 545		$ 2,981
Unpaid principal balance - with no allowance recorded	20,753
Recorded investment	17,728		22,709
Unpaid principal balance			25,176
Average impaired loans - with no allowance recorded	18,091	$ 17,400
Interest income recognized - with no allowance recorded		168
Cash basis interest recognized - with no allowance recorded	180	168
Commercial Real Estate Portfolio Segment [Member] \| Commercial Real Estate Nonowner Occupied [Member]
Unpaid principal balance - with allowance recorded	381		384
Recorded investment - with allowance recorded	381		384
Allowance for Loan Losses Allocated	98		100
Unpaid principal balance - with no allowance recorded	5,236		5,078
Recorded investment - with no allowance recorded	3,785		3,632
Average impaired loans - with allowance recorded	382	395
Interest income recognized - with allowance recorded	5	5
Cash basis interest recognized - with allowance recorded	5	5
Average impaired loans - with no allowance recorded	3,822	3,134
Interest income recognized - with no allowance recorded	21	13
Cash basis interest recognized - with no allowance recorded	21	13
Commercial Real Estate Portfolio Segment [Member] \| Commercial Real Estate Owner Occupied [Member]
Unpaid principal balance - with allowance recorded			5,477
Recorded investment - with allowance recorded			5,477
Allowance for Loan Losses Allocated			2,435
Unpaid principal balance - with no allowance recorded	4,112		3,638
Recorded investment - with no allowance recorded	3,008		3,091
Average impaired loans - with allowance recorded		204
Interest income recognized - with allowance recorded		4
Cash basis interest recognized - with allowance recorded		4
Average impaired loans - with no allowance recorded	3,547	3,257
Interest income recognized - with no allowance recorded	36	43
Cash basis interest recognized - with no allowance recorded	36	43
Commercial Real Estate Portfolio Segment [Member] \| Construction Loans [Member]
Unpaid principal balance - with allowance recorded	354
Recorded investment - with allowance recorded	345
Allowance for Loan Losses Allocated	55
Unpaid principal balance - with no allowance recorded	643		1,001
Recorded investment - with no allowance recorded	182		527
Average impaired loans - with allowance recorded	345
Interest income recognized - with allowance recorded
Cash basis interest recognized - with allowance recorded
Average impaired loans - with no allowance recorded	182	680
Interest income recognized - with no allowance recorded	4
Commercial and Industrial Portfolio Segment [Member]
Unpaid principal balance - with allowance recorded	392		392
Recorded investment - with allowance recorded	392		392
Allowance for Loan Losses Allocated	391		241
Unpaid principal balance - with no allowance recorded	8,511		8,073
Recorded investment - with no allowance recorded	8,511		8,073
Average impaired loans - with allowance recorded	392	4,439
Interest income recognized - with allowance recorded		41
Cash basis interest recognized - with allowance recorded		41
Average impaired loans - with no allowance recorded	8,292	4,341
Interest income recognized - with no allowance recorded	100	51
Cash basis interest recognized - with no allowance recorded	100	51
Consumer Portfolio Segment [Member] \| Home Equity Loan [Member]
Unpaid principal balance - with allowance recorded	209		416
Recorded investment - with allowance recorded	209		416
Allowance for Loan Losses Allocated	1		205
Average impaired loans - with allowance recorded	211	219
Interest income recognized - with allowance recorded	2	2
Cash basis interest recognized - with allowance recorded	2	2
Residential Portfolio Segment [Member]
Unpaid principal balance - with no allowance recorded	915		717
Recorded investment - with no allowance recorded	915		$ 717
Average impaired loans - with no allowance recorded	918	731
Interest income recognized - with no allowance recorded	12	9
Cash basis interest recognized - with no allowance recorded	$ 12	$ 9

Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524

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