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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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Allowance for Loan Losses Allocated	$ 499		$ 499		$ 94
Unpaid principal balance	12,712		12,712		19,917
Recorded investment	10,942		10,942		18,108
Average impaired loans	11,264	$ 17,305	11,391	$ 16,544
Interest income recognized	148	217	534	602
Cash basis interest recognized	148	217	534	602
Residential Portfolio Segment [Member]
Unpaid principal balance - with allowance recorded	715		715
Recorded investment - with allowance recorded	707		707
Allowance for Loan Losses Allocated	409		409
Unpaid principal balance - with no allowance recorded	219		219		1,420
Recorded investment - with no allowance recorded	219		219		1,420
Average impaired loans - with allowance recorded	707	221	711	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	219	935	222	824
Interest income recognized - with no allowance recorded	4	10	34	37
Cash basis interest recognized - with no allowance recorded	4	10	34	37
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member]
Unpaid principal balance - with allowance recorded	363		363		372
Recorded investment - with allowance recorded	363		363		372
Allowance for Loan Losses Allocated	90		90		94
Unpaid principal balance - with no allowance recorded	2,932		2,932		4,989
Recorded investment - with no allowance recorded	1,510		1,510		3,534
Average impaired loans - with allowance recorded	365	563	368	584
Interest income recognized - with allowance recorded	3	3	12	12
Cash basis interest recognized - with allowance recorded	3	3	12	12
Average impaired loans - with no allowance recorded	1,786	3,552	2,154	3,518
Interest income recognized - with no allowance recorded	11	19	47	57
Cash basis interest recognized - with no allowance recorded	11	19	47	57
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member]
Unpaid principal balance - with no allowance recorded	2,416		2,416		3,427
Recorded investment - with no allowance recorded	2,416		2,416		3,427
Average impaired loans - with no allowance recorded	2,434	2,409	2,462	2,407
Interest income recognized - with no allowance recorded	36	37	105	112
Cash basis interest recognized - with no allowance recorded	36	37	105	112
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Unpaid principal balance - with no allowance recorded	340		340		352
Recorded investment - with no allowance recorded
Average impaired loans - with no allowance recorded		157		170
Interest income recognized - with no allowance recorded	5	5	15	14
Cash basis interest recognized - with no allowance recorded	5	5	15	14
Commercial and Industrial Portfolio Segment [Member]
Unpaid principal balance - with no allowance recorded	5,727		5,727		9,154
Recorded investment - with no allowance recorded	5,727		5,727		9,154
Average impaired loans - with no allowance recorded	5,753	9,260	5,474	8,776
Interest income recognized - with no allowance recorded	89	135	321	358
Cash basis interest recognized - with no allowance recorded	$ 89	135	$ 321	358
Consumer Portfolio Segment [Member] | Home Equity Loan [Member]
Unpaid principal balance - with allowance recorded					203
Recorded investment - with allowance recorded					$ 201
Average impaired loans - with allowance recorded		208		210
Interest income recognized - with allowance recorded		1		5
Cash basis interest recognized - with allowance recorded		$ 1		$ 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.

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