Note 5 - Loans and Allowance for Loan Losses - Impaired Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Impaired Loans with No Related Allowance Recorded:
Impaired Loans with No Related Allowance Recorded Recorded Investment	$ 6,775	$ 6,544
Impaired Loans with No Related Allowance Recorded Unpaid Principal Balance	6,806	6,793
Total Impaired Loans Individually Reviewed for Impairment
Impaired Loans with an Allowance Recorded Recorded Investment	1,623	1,930
Impaired Loans with an Allowance Recorded Unpaid Principal Balance	1,631	1,954
Impaired Loans Related Allowance	242	198
Individually Reviewed for Impairment [Member]
Total Impaired Loans Individually Reviewed for Impairment
Impaired Loans Recorded Investment	8,398	8,474
Impaired Loans Unpaid Principal Balance	8,437	8,747
Impaired Loans Related Allowance	242	198
Commercial Portfolio Segment [Member]
Impaired Loans with No Related Allowance Recorded:
Impaired Loans with No Related Allowance Recorded Recorded Investment	3,543	3,309
Impaired Loans with No Related Allowance Recorded Unpaid Principal Balance	3,560	3,526
Total Impaired Loans Individually Reviewed for Impairment
Impaired Loans Recorded Investment	3,543	3,772
Impaired Loans Unpaid Principal Balance	3,560	3,989
Impaired Loans with an Allowance Recorded Recorded Investment	0	463
Impaired Loans with an Allowance Recorded Unpaid Principal Balance	0	463
Impaired Loans Related Allowance	0	2
Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member]
Impaired Loans with No Related Allowance Recorded:
Impaired Loans with No Related Allowance Recorded Recorded Investment	461	0
Impaired Loans with No Related Allowance Recorded Unpaid Principal Balance	463	0
Total Impaired Loans Individually Reviewed for Impairment
Impaired Loans Recorded Investment	461	0
Impaired Loans Unpaid Principal Balance	463	0
Impaired Loans with an Allowance Recorded Recorded Investment	0	0
Impaired Loans with an Allowance Recorded Unpaid Principal Balance	0	0
Impaired Loans Related Allowance	0	0
Commercial Portfolio Segment [Member] \| Commercial Real Estate Owner Occupied [Member]
Impaired Loans with No Related Allowance Recorded:
Impaired Loans with No Related Allowance Recorded Recorded Investment	434	995
Impaired Loans with No Related Allowance Recorded Unpaid Principal Balance	436	1,078
Total Impaired Loans Individually Reviewed for Impairment
Impaired Loans Recorded Investment	434	995
Impaired Loans Unpaid Principal Balance	436	1,078
Impaired Loans with an Allowance Recorded Recorded Investment	0	0
Impaired Loans with an Allowance Recorded Unpaid Principal Balance	0	0
Impaired Loans Related Allowance	0	0
Commercial Portfolio Segment [Member] \| Commercial Real Estate Investor Income Producing [Member]
Impaired Loans with No Related Allowance Recorded:
Impaired Loans with No Related Allowance Recorded Recorded Investment	1,874	1,481
Impaired Loans with No Related Allowance Recorded Unpaid Principal Balance	1,883	1,489
Total Impaired Loans Individually Reviewed for Impairment
Impaired Loans Recorded Investment	1,874	1,944
Impaired Loans Unpaid Principal Balance	1,883	1,952
Impaired Loans with an Allowance Recorded Recorded Investment	0	463
Impaired Loans with an Allowance Recorded Unpaid Principal Balance	0	463
Impaired Loans Related Allowance	0	2
Commercial Portfolio Segment [Member] \| AC&D - 1 - 4 Family Construction [Member]
Impaired Loans with No Related Allowance Recorded:
Impaired Loans with No Related Allowance Recorded Recorded Investment	0	0
Impaired Loans with No Related Allowance Recorded Unpaid Principal Balance	0	0
Total Impaired Loans Individually Reviewed for Impairment
Impaired Loans Recorded Investment	0	0
Impaired Loans Unpaid Principal Balance	0	0
Impaired Loans with an Allowance Recorded Recorded Investment	0	0
Impaired Loans with an Allowance Recorded Unpaid Principal Balance	0	0
Impaired Loans Related Allowance	0	0
Commercial Portfolio Segment [Member] \| AC&D - Lots, Land, & Development [Member]
Impaired Loans with No Related Allowance Recorded:
Impaired Loans with No Related Allowance Recorded Recorded Investment	564	622
Impaired Loans with No Related Allowance Recorded Unpaid Principal Balance	567	748
Total Impaired Loans Individually Reviewed for Impairment
Impaired Loans Recorded Investment	564	622
Impaired Loans Unpaid Principal Balance	567	748
Impaired Loans with an Allowance Recorded Recorded Investment	0	0
Impaired Loans with an Allowance Recorded Unpaid Principal Balance	0	0
Impaired Loans Related Allowance	0	0
Commercial Portfolio Segment [Member] \| AC&D - CRE [Member]
Impaired Loans with No Related Allowance Recorded:
Impaired Loans with No Related Allowance Recorded Recorded Investment	0	0
Impaired Loans with No Related Allowance Recorded Unpaid Principal Balance	0	0
Total Impaired Loans Individually Reviewed for Impairment
Impaired Loans Recorded Investment	0	0
Impaired Loans Unpaid Principal Balance	0	0
Impaired Loans with an Allowance Recorded Recorded Investment	0	0
Impaired Loans with an Allowance Recorded Unpaid Principal Balance	0	0
Impaired Loans Related Allowance	0	0
Commercial Portfolio Segment [Member] \| Other Commercial [Member]
Impaired Loans with No Related Allowance Recorded:
Impaired Loans with No Related Allowance Recorded Recorded Investment	210	211
Impaired Loans with No Related Allowance Recorded Unpaid Principal Balance	211	211
Total Impaired Loans Individually Reviewed for Impairment
Impaired Loans Recorded Investment	210	211
Impaired Loans Unpaid Principal Balance	211	211
Impaired Loans with an Allowance Recorded Recorded Investment	0	0
Impaired Loans with an Allowance Recorded Unpaid Principal Balance	0	0
Impaired Loans Related Allowance	0	0
Consumer Portfolio Segment [Member]
Impaired Loans with No Related Allowance Recorded:
Impaired Loans with No Related Allowance Recorded Recorded Investment	3,232	3,235
Impaired Loans with No Related Allowance Recorded Unpaid Principal Balance	3,246	3,267
Total Impaired Loans Individually Reviewed for Impairment
Impaired Loans Recorded Investment	4,855	4,702
Impaired Loans Unpaid Principal Balance	4,877	4,758
Impaired Loans with an Allowance Recorded Recorded Investment	1,623	1,467
Impaired Loans with an Allowance Recorded Unpaid Principal Balance	1,631	1,491
Impaired Loans Related Allowance	242	196
Consumer Portfolio Segment [Member] \| Residential Mortgage Loans [Member]
Impaired Loans with No Related Allowance Recorded:
Impaired Loans with No Related Allowance Recorded Recorded Investment	2,161	2,052
Impaired Loans with No Related Allowance Recorded Unpaid Principal Balance	2,171	2,077
Total Impaired Loans Individually Reviewed for Impairment
Impaired Loans Recorded Investment	2,161	2,052
Impaired Loans Unpaid Principal Balance	2,171	2,077
Impaired Loans with an Allowance Recorded Recorded Investment	0	0
Impaired Loans with an Allowance Recorded Unpaid Principal Balance	0	0
Impaired Loans Related Allowance	0	0
Consumer Portfolio Segment [Member] \| Home Equity Lines of Credit [Member]
Impaired Loans with No Related Allowance Recorded:
Impaired Loans with No Related Allowance Recorded Recorded Investment	1,071	1,183
Impaired Loans with No Related Allowance Recorded Unpaid Principal Balance	1,075	1,190
Total Impaired Loans Individually Reviewed for Impairment
Impaired Loans Recorded Investment	2,473	2,407
Impaired Loans Unpaid Principal Balance	2,484	2,438
Impaired Loans with an Allowance Recorded Recorded Investment	1,402	1,224
Impaired Loans with an Allowance Recorded Unpaid Principal Balance	1,409	1,248
Impaired Loans Related Allowance	222	176
Consumer Portfolio Segment [Member] \| Residential Construction [Member]
Impaired Loans with No Related Allowance Recorded:
Impaired Loans with No Related Allowance Recorded Recorded Investment	0	0
Impaired Loans with No Related Allowance Recorded Unpaid Principal Balance	0	0
Total Impaired Loans Individually Reviewed for Impairment
Impaired Loans Recorded Investment	221	243
Impaired Loans Unpaid Principal Balance	222	243
Impaired Loans with an Allowance Recorded Recorded Investment	221	243
Impaired Loans with an Allowance Recorded Unpaid Principal Balance	222	243
Impaired Loans Related Allowance	20	20
Consumer Portfolio Segment [Member] \| Other Loans to Individuals [Member]
Impaired Loans with No Related Allowance Recorded:
Impaired Loans with No Related Allowance Recorded Recorded Investment	0	0
Impaired Loans with No Related Allowance Recorded Unpaid Principal Balance	0	0
Total Impaired Loans Individually Reviewed for Impairment
Impaired Loans Recorded Investment	0	0
Impaired Loans Unpaid Principal Balance	0	0
Impaired Loans with an Allowance Recorded Recorded Investment	0	0
Impaired Loans with an Allowance Recorded Unpaid Principal Balance	0	0
Impaired Loans Related Allowance	$ 0	$ 0

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