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Note 4 - Loans and Allowance for Loan Losses - Aging Analysis of Past Due Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Total loans	$ 357,458	$ 334,781
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Total loans	26,143	23,772
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Total loans	45,073	46,679
Real Estate [Member] | Secured by Multi-family Residential Properties [Member]
Total loans	16,579	16,627
Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member]
Total loans	105,133	102,112
Real Estate [Member] | Other Real Estate Loans [Member]
Total loans	190	234
Commercial and Industrial Loans [Member]
Total loans	69,969	57,963
Consumer Portfolio Segment [Member] | Consumer Loans [Member]
Total loans	39,300	42,619
Consumer Portfolio Segment [Member] | Indirect Sales [Member]
Total loans	55,071	44,775
FUSB [Member]
Total past due	404	1,268
Current	257,099	238,601
Total loans	257,503	239,869
Accruing loans past due 90 days or more amounted
FUSB [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Total past due	352	926
FUSB [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Total past due	52	245
FUSB [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Total past due		97
FUSB [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Total past due		86
Current	26,143	23,686
Total loans	26,143	23,772
Accruing loans past due 90 days or more amounted
FUSB [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Total past due
FUSB [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Total past due		86
FUSB [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Total past due	279	378
Current	33,993	32,577
Total loans	34,272	32,955
Accruing loans past due 90 days or more amounted
FUSB [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Total past due	227	164
FUSB [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Total past due	52	145
FUSB [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Total past due		69
FUSB [Member] | Real Estate [Member] | Secured by Multi-family Residential Properties [Member]
Current	16,579	16,627
Total loans	16,579	16,627
Accruing loans past due 90 days or more amounted
FUSB [Member] | Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member]
Total past due	13	762
Current	105,120	101,350
Total loans	105,133	102,112
Accruing loans past due 90 days or more amounted
FUSB [Member] | Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Total past due	13	762
FUSB [Member] | Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Total past due
FUSB [Member] | Real Estate [Member] | Other Real Estate Loans [Member]
Current	190	234
Total loans	190	234
Accruing loans past due 90 days or more amounted
FUSB [Member] | Commercial and Industrial Loans [Member]
Total past due	70	14
Current	69,899	57,949
Total loans	69,969	57,963
Accruing loans past due 90 days or more amounted
FUSB [Member] | Commercial and Industrial Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Total past due	70
FUSB [Member] | Commercial and Industrial Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Total past due		14
FUSB [Member] | Commercial and Industrial Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Total past due
FUSB [Member] | Consumer Portfolio Segment [Member]
Total past due	42	28
Current	5,175	6,178
Total loans	5,217	6,206
Accruing loans past due 90 days or more amounted
FUSB [Member] | Consumer Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Total past due	42
FUSB [Member] | Consumer Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Total past due
FUSB [Member] | Consumer Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Total past due		28
FUSB [Member] | Consumer Portfolio Segment [Member] | Consumer Loans [Member]
Total loans	5,217	6,206
FUSB [Member] | Consumer Portfolio Segment [Member] | Indirect Sales [Member]
Total loans
ALC [Member]
Total past due	3,242	3,080
Current	96,713	91,832
Total loans	99,955	94,912
Accruing loans past due 90 days or more amounted
ALC [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Total past due	832	693
ALC [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Total past due	1,834	1,806
ALC [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Total past due	576	581
ALC [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Total loans
Accruing loans past due 90 days or more amounted
ALC [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Total past due	374	303
Current	10,427	13,421
Total loans	10,801	13,724
Accruing loans past due 90 days or more amounted
ALC [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Total past due	61	61
ALC [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Total past due	290	213
ALC [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Total past due	23	29
ALC [Member] | Real Estate [Member] | Secured by Multi-family Residential Properties [Member]
Current
Total loans
Accruing loans past due 90 days or more amounted
ALC [Member] | Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member]
Current
Total loans
Accruing loans past due 90 days or more amounted
ALC [Member] | Real Estate [Member] | Other Real Estate Loans [Member]
Current
Total loans
Accruing loans past due 90 days or more amounted
ALC [Member] | Commercial and Industrial Loans [Member]
Current
Total loans
Accruing loans past due 90 days or more amounted
ALC [Member] | Consumer Portfolio Segment [Member] | Consumer Loans [Member]
Total past due	1,924	1,958
Current	32,159	34,455
Total loans	34,083	36,413
Accruing loans past due 90 days or more amounted
ALC [Member] | Consumer Portfolio Segment [Member] | Consumer Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Total past due	490	441
ALC [Member] | Consumer Portfolio Segment [Member] | Consumer Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Total past due	1,111	1,104
ALC [Member] | Consumer Portfolio Segment [Member] | Consumer Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Total past due	323	413
ALC [Member] | Consumer Portfolio Segment [Member] | Indirect Sales [Member]
Total past due	944	819
Current	54,127	43,956
Total loans	55,071	44,775
Accruing loans past due 90 days or more amounted
ALC [Member] | Consumer Portfolio Segment [Member] | Indirect Sales [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Total past due	281	191
ALC [Member] | Consumer Portfolio Segment [Member] | Indirect Sales [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Total past due	433	489
ALC [Member] | Consumer Portfolio Segment [Member] | Indirect Sales [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Total past due	$ 230	$ 139

X

- Definition

Recorded investment in financing receivables that are 90 days or more past due and still accruing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524

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- Definition

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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 7A
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953401-111524

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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 7A
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953401-111524

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 310
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-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

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