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Note 4 - Loans and Allowance for Loan Losses - Loans Individually Evaluated for Impairment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Allowance for Loan Losses Allocated	$ 240		$ 240		$ 2,981
Unpaid principal balance	19,683		19,683		25,176
Recorded investment	17,681		17,681		22,709
Average impaired loans - with no allowance recorded		$ 22,564		$ 19,735
Interest income recognized - with no allowance recorded		288		874
Cash basis interest recognized - with no allowance recorded		288		874
Average impaired loans	17,305		16,544
Interest income recognized	217		602
Cash basis interest recognized	217		602
Residential Portfolio Segment [Member]
Unpaid principal balance - with allowance recorded	224		224
Recorded investment - with allowance recorded	221		221
Allowance for Loan Losses Allocated	127		127
Unpaid principal balance - with no allowance recorded	932		932		717
Recorded investment - with no allowance recorded	932		932		717
Average impaired loans - with allowance recorded	221		55
Interest income recognized - with allowance recorded	7		7
Cash basis interest recognized - with allowance recorded	7		7
Average impaired loans - with no allowance recorded	935	725	824	728
Interest income recognized - with no allowance recorded	10	4	37	20
Cash basis interest recognized - with no allowance recorded	10	4	37	20
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	2,563		2,563		3,638
Recorded investment - with no allowance recorded	2,563		2,563		3,091
Average impaired loans - with allowance recorded		5,427		2,815
Interest income recognized - with allowance recorded		94		241
Cash basis interest recognized - with allowance recorded		94		241
Average impaired loans - with no allowance recorded	2,409	2,797	2,407	2,879
Interest income recognized - with no allowance recorded	37	37	112	120
Cash basis interest recognized - with no allowance recorded	37	37	112	120
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member]
Unpaid principal balance - with allowance recorded	604		604		384
Recorded investment - with allowance recorded	530		530		384
Allowance for Loan Losses Allocated	111		111		100
Unpaid principal balance - with no allowance recorded	4,995		4,995		5,078
Recorded investment - with no allowance recorded	3,548		3,548		3,632
Average impaired loans - with allowance recorded	563	389	584	392
Interest income recognized - with allowance recorded	3	5	12	15
Cash basis interest recognized - with allowance recorded	3	5	12	15
Average impaired loans - with no allowance recorded	3,552	3,680	3,518	3,557
Interest income recognized - with no allowance recorded	19	33	57	75
Cash basis interest recognized - with no allowance recorded	19	33	57	75
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Unpaid principal balance - with no allowance recorded	635		635		1,001
Recorded investment - with no allowance recorded	157		157		527
Average impaired loans - with allowance recorded	157		170
Interest income recognized - with allowance recorded	5		14
Cash basis interest recognized - with allowance recorded	5		14
Average impaired loans - with no allowance recorded		363		521
Interest income recognized - with no allowance recorded		11		108
Cash basis interest recognized - with no allowance recorded		11		108
Commercial and Industrial Portfolio Segment [Member]
Unpaid principal balance - with allowance recorded					392
Recorded investment - with allowance recorded					392
Allowance for Loan Losses Allocated					241
Unpaid principal balance - with no allowance recorded	9,522		9,522		8,073
Recorded investment - with no allowance recorded	9,522		9,522		8,073
Average impaired loans - with allowance recorded	9,260	391	8,776	391
Interest income recognized - with allowance recorded	135		358
Cash basis interest recognized - with allowance recorded	135		358
Average impaired loans - with no allowance recorded		8,575		8,234
Interest income recognized - with no allowance recorded		103		290
Cash basis interest recognized - with no allowance recorded		103		290
Consumer Portfolio Segment [Member] | Home Equity Loan [Member]
Unpaid principal balance - with allowance recorded	208		208		416
Recorded investment - with allowance recorded	208		208		416
Allowance for Loan Losses Allocated	2		2		$ 205
Average impaired loans - with allowance recorded	208	217	210	218
Interest income recognized - with allowance recorded	1	1	5	5
Cash basis interest recognized - with allowance recorded	$ 1	$ 1	$ 5	$ 5

X

- Definition

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

+ References

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)
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-Publisher FASB
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