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Note 4 - Loans and Allowance for Loan Losses - Aging Analysis of Past Due Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Total loans	$ 349,182	$ 334,781
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Total loans	20,213	23,772
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Total loans	46,615	46,679
Real Estate [Member] | Secured by Multi-family Residential Properties [Member]
Total loans	16,498	16,627
Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member]
Total loans	107,679	102,112
Real Estate [Member] | Other Real Estate Loans [Member]
Total loans	223	234
Commercial and Industrial Loans [Member]
Total loans	66,320	57,963
Consumer Portfolio Segment [Member] | Consumer Loans [Member]
Total loans	41,081	42,619
Consumer Portfolio Segment [Member] | Indirect Sales [Member]
Total loans	50,553	44,775
FUSB [Member]
Total past due	449	1,268
Current	251,040	238,601
Total loans	251,489	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	218	926
FUSB [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Total past due	114	245
FUSB [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Total past due	117	97
FUSB [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Total past due	23	86
Current	20,190	23,686
Total loans	20,213	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	23
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	240	378
Current	34,885	32,577
Total loans	35,125	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	149	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	91	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	16,498	16,627
Total loans	16,498	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	132	762
Current	107,547	101,350
Total loans	107,679	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	15	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	117
FUSB [Member] | Real Estate [Member] | Other Real Estate Loans [Member]
Current	223	234
Total loans	223	234
Accruing loans past due 90 days or more amounted
FUSB [Member] | Commercial and Industrial Loans [Member]
Total past due	31	14
Current	66,289	57,949
Total loans	66,320	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	31
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	23	28
Current	5,408	6,178
Total loans	5,431	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
FUSB [Member] | Consumer Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Total past due	23
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	5,431	6,206
FUSB [Member] | Consumer Portfolio Segment [Member] | Indirect Sales [Member]
Total loans
ALC [Member]
Total past due	2,987	3,080
Current	94,706	91,832
Total loans	97,693	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	793	693
ALC [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Total past due	1,470	1,806
ALC [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Total past due	724	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	214	303
Current	11,276	13,421
Total loans	11,490	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	73	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	71	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	70	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	1,955	1,958
Current	33,695	34,455
Total loans	35,650	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	506	441
ALC [Member] | Consumer Portfolio Segment [Member] | Consumer Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Total past due	1,016	1,104
ALC [Member] | Consumer Portfolio Segment [Member] | Consumer Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Total past due	433	413
ALC [Member] | Consumer Portfolio Segment [Member] | Indirect Sales [Member]
Total past due	818	819
Current	49,735	43,956
Total loans	50,553	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	214	191
ALC [Member] | Consumer Portfolio Segment [Member] | Indirect Sales [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Total past due	383	489
ALC [Member] | Consumer Portfolio Segment [Member] | Indirect Sales [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Total past due	$ 221	$ 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
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