Note 5 - Loans and Allowance for Loan Losses - Impaired Loans (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Recorded investment with no allowance	$ 3,394	$ 5,474
Unpaid principal balance with no allowance	4,081	6,195
Average recorded investment with no allowance	5,026	3,551
Interest income recognized with no allowance	92	97
Recorded investment with allowance	313	472
Unpaid principal balance with allowance	319	503
Related allowance	85	166
Average recorded investment with allowance	350	703
Interest income recognized with allowance	0	0
Recorded investment	3,707	5,946
Unpaid principle balance	4,400	6,698
Average recorded investment	5,376	4,254
Interest income recognized	92	97
Real Estate Mortgage Portfolio Segment [Member] \| Residential Loan [Member]
Recorded investment with no allowance	1,871	1,938
Unpaid principal balance with no allowance	2,223	2,330
Average recorded investment with no allowance	1,904	1,356
Interest income recognized with no allowance	26	19
Recorded investment with allowance	212	58
Unpaid principal balance with allowance	217	62
Related allowance	23	6
Average recorded investment with allowance	148	190
Interest income recognized with allowance	0	0
Recorded investment	2,083	1,996
Unpaid principle balance	2,440	2,392
Average recorded investment	2,052	1,546
Interest income recognized	26	19
Real Estate Mortgage Portfolio Segment [Member] \| Land Loan [Member]
Recorded investment with no allowance	0	24
Unpaid principal balance with no allowance	0	27
Average recorded investment with no allowance	5	20
Interest income recognized with no allowance	0	0
Recorded investment with allowance	0	0
Unpaid principal balance with allowance	0	0
Related allowance	0	0
Average recorded investment with allowance	0	0
Interest income recognized with allowance	0	0
Recorded investment	0	24
Unpaid principle balance	0	27
Average recorded investment	5	20
Interest income recognized	0	0
Real Estate Mortgage Portfolio Segment [Member] \| Construction Loans [Member]
Recorded investment with no allowance	0	0
Unpaid principal balance with no allowance	0	0
Average recorded investment with no allowance	0	0
Interest income recognized with no allowance	3	0
Recorded investment with allowance	0	0
Unpaid principal balance with allowance	0	0
Related allowance	0	0
Average recorded investment with allowance	0	0
Interest income recognized with allowance	0	0
Recorded investment	0	0
Unpaid principle balance	0	0
Average recorded investment	0	0
Interest income recognized	3	0
Real Estate Mortgage Portfolio Segment [Member] \| Commercial Real Estate Loan [Member]
Recorded investment with no allowance	1,217	3,389
Unpaid principal balance with no allowance	1,540	3,706
Average recorded investment with no allowance	2,959	2,092
Interest income recognized with no allowance	60	76
Recorded investment with allowance	0	234
Unpaid principal balance with allowance	0	260
Related allowance	0	49
Average recorded investment with allowance	99	78
Interest income recognized with allowance	0	0
Recorded investment	1,217	3,623
Unpaid principle balance	1,540	3,966
Average recorded investment	3,058	2,170
Interest income recognized	60	76
Commercial Portfolio Segment [Member]
Recorded investment with no allowance	75	67
Unpaid principal balance with no allowance	81	67
Average recorded investment with no allowance	66	19
Interest income recognized with no allowance	0	0
Recorded investment with allowance	68	100
Unpaid principal balance with allowance	68	100
Related allowance	43	100
Average recorded investment with allowance	54	355
Interest income recognized with allowance	0	0
Recorded investment	143	167
Unpaid principle balance	149	167
Average recorded investment	120	374
Interest income recognized	0	0
Consumer Portfolio Segment [Member] \| Home Equity and Second Mortgage [Member]
Recorded investment with no allowance	231	56
Unpaid principal balance with no allowance	237	65
Average recorded investment with no allowance	88	64
Interest income recognized with no allowance	2	2
Recorded investment with allowance	13	80
Unpaid principal balance with allowance	14	81
Related allowance	13	11
Average recorded investment with allowance	27	80
Interest income recognized with allowance	0	0
Recorded investment	244	136
Unpaid principle balance	251	146
Average recorded investment	115	144
Interest income recognized	2	2
Consumer Portfolio Segment [Member] \| Other Consumer Loan [Member]
Recorded investment with no allowance	0	0
Unpaid principal balance with no allowance	0	0
Average recorded investment with no allowance	4	0
Interest income recognized with no allowance	1	0
Recorded investment with allowance	20	0
Unpaid principal balance with allowance	20	0
Related allowance	6	0
Average recorded investment with allowance	22	0
Interest income recognized with allowance	0	0
Recorded investment	20	0
Unpaid principle balance	20	0
Average recorded investment	26	0
Interest income recognized	$ 1	$ 0

Average 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 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5258-111524

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+ References

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=66008989&loc=SL6953550-111524

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5258-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

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