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Note 4 - Loans and Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Jun. 30, 2018	Dec. 31, 2017
Beginning balance			$ 4,774	$ 4,856	$ 4,856
Charge-offs			(1,534)		(2,991)
Recoveries			352		922
Provision for loan losses	$ 702	$ 576	1,360	1,091	1,987
Ending balance	4,952		4,952		4,774
Individually evaluated for impairment						$ 90	$ 98
Collectively evaluated for impairment						4,862	4,676
Total allowance for loan losses	4,952		4,952	4,856	4,774	4,952	4,774
Individually evaluated for impairment						777	791
Collectively evaluated for impairment						366,338	356,667
Total loans receivable						367,115	357,458
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Beginning balance			203	535	535
Charge-offs
Recoveries
Provision for loan losses			(37)		(332)
Ending balance	166		166		203
Individually evaluated for impairment
Collectively evaluated for impairment						166	203
Total allowance for loan losses	166		203	535	203	166	203
Individually evaluated for impairment
Collectively evaluated for impairment						22,878	26,143
Total loans receivable						22,878	26,143
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Beginning balance			290	411	411
Charge-offs			(41)		(28)
Recoveries			35		135
Provision for loan losses			11		(228)
Ending balance	295		295		290
Individually evaluated for impairment						5	5
Collectively evaluated for impairment						290	285
Total allowance for loan losses	295		290	411	290	295	290
Individually evaluated for impairment						185	187
Collectively evaluated for impairment						47,959	44,886
Total loans receivable						48,144	45,073
Real Estate [Member] | Secured by Multi-family Residential Properties [Member]
Beginning balance			116	88	88
Charge-offs
Recoveries
Provision for loan losses			12		28
Ending balance	128		128		116
Individually evaluated for impairment
Collectively evaluated for impairment						128	116
Total allowance for loan losses	128		116	88	116	128	116
Individually evaluated for impairment
Collectively evaluated for impairment						18,374	16,579
Total loans receivable						18,374	16,579
Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member]
Beginning balance			777	903	903
Charge-offs
Recoveries			3		69
Provision for loan losses			28		(195)
Ending balance	808		808		777
Individually evaluated for impairment						17	21
Collectively evaluated for impairment						791	756
Total allowance for loan losses	808		777	903	777	808	777
Individually evaluated for impairment						524	532
Collectively evaluated for impairment						111,937	104,601
Total loans receivable						112,461	105,133
Real Estate [Member] | Other Real Estate Loans [Member]
Beginning balance			2	2	2
Charge-offs
Recoveries
Provision for loan losses
Ending balance	2		2		2
Individually evaluated for impairment
Collectively evaluated for impairment						2	2
Total allowance for loan losses	2		2	2	2	2	2
Individually evaluated for impairment
Collectively evaluated for impairment						187	190
Total loans receivable						187	190
Commercial and Industrial Loans [Member]
Beginning balance			1,049	527	527
Charge-offs			(2)		(16)
Recoveries			7		19
Provision for loan losses			44		519
Ending balance	1,098		1,098		1,049
Individually evaluated for impairment						68	72
Collectively evaluated for impairment						1,030	977
Total allowance for loan losses	1,098		1,049	527	1,049	1,098	1,049
Individually evaluated for impairment						68	72
Collectively evaluated for impairment						59,252	69,897
Total loans receivable						59,320	69,969
Consumer Portfolio Segment [Member] | Consumer Loans [Member]
Beginning balance			1,715	1,767	1,767
Charge-offs			(1,213)		(2,360)
Recoveries			253		601
Provision for loan losses			1,015		1,707
Ending balance	1,770		1,770		1,715
Individually evaluated for impairment
Collectively evaluated for impairment						1,770	1,715
Total allowance for loan losses	1,770		1,715	1,767	1,715	1,770	1,715
Individually evaluated for impairment
Collectively evaluated for impairment						38,322	39,300
Total loans receivable						38,322	39,300
Consumer Portfolio Segment [Member] | Indirect Sales [Member]
Beginning balance			622	623	623
Charge-offs			(278)		(587)
Recoveries			54		98
Provision for loan losses			287		488
Ending balance	685		685		622
Individually evaluated for impairment
Collectively evaluated for impairment						685	622
Total allowance for loan losses	685		622	623	622	685	622
Individually evaluated for impairment
Collectively evaluated for impairment						67,429	55,071
Total loans receivable						67,429	55,071
FUSB [Member]
Beginning balance			2,447	2,409	2,409
Charge-offs			(11)		(79)
Recoveries			45		247
Provision for loan losses			39		(130)
Ending balance	2,520		2,520		2,447
Individually evaluated for impairment						90	98
Collectively evaluated for impairment						2,430	2,349
Total allowance for loan losses	2,520		2,520	2,409	2,447	2,520	2,447
Individually evaluated for impairment						777	791
Collectively evaluated for impairment						256,831	256,712
Total loans receivable						257,608	257,503
FUSB [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Beginning balance			203	535	535
Charge-offs
Recoveries
Provision for loan losses			(37)		(332)
Ending balance	166		166		203
Individually evaluated for impairment
Collectively evaluated for impairment						166	203
Total allowance for loan losses	166		203	535	203	166	203
Individually evaluated for impairment
Collectively evaluated for impairment						22,878	26,143
Total loans receivable						22,878	26,143
FUSB [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Beginning balance			238	304	304
Charge-offs			(9)
Recoveries			27		103
Provision for loan losses			15		(169)
Ending balance	271		271		238
Individually evaluated for impairment						5	5
Collectively evaluated for impairment						266	233
Total allowance for loan losses	271		238	304	238	271	238
Individually evaluated for impairment						185	187
Collectively evaluated for impairment						38,783	34,085
Total loans receivable						38,968	34,272
FUSB [Member] | Real Estate [Member] | Secured by Multi-family Residential Properties [Member]
Beginning balance			116	88	88
Charge-offs
Recoveries
Provision for loan losses			12		28
Ending balance	128		128		116
Individually evaluated for impairment
Collectively evaluated for impairment						128	116
Total allowance for loan losses	128		116	88	116	128	116
Individually evaluated for impairment
Collectively evaluated for impairment						18,374	16,579
Total loans receivable						18,374	16,579
FUSB [Member] | Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member]
Beginning balance			777	903	903
Charge-offs
Recoveries			3		69
Provision for loan losses			28		(195)
Ending balance	808		808		777
Individually evaluated for impairment						17	21
Collectively evaluated for impairment						791	756
Total allowance for loan losses	808		777	903	777	808	777
Individually evaluated for impairment						524	532
Collectively evaluated for impairment						111,937	104,601
Total loans receivable						112,461	105,133
FUSB [Member] | Real Estate [Member] | Other Real Estate Loans [Member]
Beginning balance			2	2	2
Charge-offs
Recoveries
Provision for loan losses
Ending balance	2		2		2
Individually evaluated for impairment
Collectively evaluated for impairment						2	2
Total allowance for loan losses	2		2	2	2	2	2
Individually evaluated for impairment
Collectively evaluated for impairment						187	190
Total loans receivable						187	190
FUSB [Member] | Commercial and Industrial Loans [Member]
Beginning balance			1,049	527	527
Charge-offs			(2)		(16)
Recoveries			7		19
Provision for loan losses			44		519
Ending balance	1,098		1,098		1,049
Individually evaluated for impairment						68	72
Collectively evaluated for impairment						1,030	977
Total allowance for loan losses	1,098		1,049	527	1,049	1,098	1,049
Individually evaluated for impairment						68	72
Collectively evaluated for impairment						59,252	69,897
Total loans receivable						59,320	69,969
FUSB [Member] | Consumer Portfolio Segment [Member]
Total loans receivable						5,420	5,217
FUSB [Member] | Consumer Portfolio Segment [Member] | Consumer Loans [Member]
Beginning balance			62	50	50
Charge-offs					(63)
Recoveries			8		56
Provision for loan losses			(23)		19
Ending balance	47		47		62
Individually evaluated for impairment
Collectively evaluated for impairment						47	62
Total allowance for loan losses	47		62	50	62	47	62
Individually evaluated for impairment
Collectively evaluated for impairment						5,420	5,217
Total loans receivable						5,420	5,217
FUSB [Member] | Consumer Portfolio Segment [Member] | Indirect Sales [Member]
Beginning balance
Charge-offs
Recoveries
Provision for loan losses
Ending balance
Individually evaluated for impairment
Collectively evaluated for impairment
Total allowance for loan losses
Individually evaluated for impairment
Collectively evaluated for impairment
Total loans receivable
ALC [Member]
Beginning balance			2,327	2,447	2,447
Charge-offs			(1,523)		(2,912)
Recoveries			307		675
Provision for loan losses			1,321		2,117
Ending balance	2,432		2,432		2,327
Individually evaluated for impairment
Collectively evaluated for impairment						2,432	2,327
Total allowance for loan losses	2,432		2,432	2,447	2,327	2,432	2,327
Individually evaluated for impairment
Collectively evaluated for impairment						109,507	99,955
Total loans receivable						109,507	99,955
ALC [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Beginning balance
Charge-offs
Recoveries
Provision for loan losses
Ending balance
Individually evaluated for impairment
Collectively evaluated for impairment
Total allowance for loan losses
Individually evaluated for impairment
Collectively evaluated for impairment
Total loans receivable
ALC [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Beginning balance			52	107	107
Charge-offs			(32)		(28)
Recoveries			8		32
Provision for loan losses			(4)		(59)
Ending balance	24		24		52
Individually evaluated for impairment
Collectively evaluated for impairment						24	52
Total allowance for loan losses	24		52	107	52	24	52
Individually evaluated for impairment
Collectively evaluated for impairment						9,176	10,801
Total loans receivable						9,176	10,801
ALC [Member] | Real Estate [Member] | Secured by Multi-family Residential Properties [Member]
Beginning balance
Charge-offs
Recoveries
Provision for loan losses
Ending balance
Individually evaluated for impairment
Collectively evaluated for impairment
Total allowance for loan losses
Individually evaluated for impairment
Collectively evaluated for impairment
Total loans receivable
ALC [Member] | Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member]
Beginning balance
Charge-offs
Recoveries
Provision for loan losses
Ending balance
Individually evaluated for impairment
Collectively evaluated for impairment
Total allowance for loan losses
Individually evaluated for impairment
Collectively evaluated for impairment
Total loans receivable
ALC [Member] | Real Estate [Member] | Other Real Estate Loans [Member]
Beginning balance
Charge-offs
Recoveries
Provision for loan losses
Ending balance
Individually evaluated for impairment
Collectively evaluated for impairment
Total allowance for loan losses
Individually evaluated for impairment
Collectively evaluated for impairment
Total loans receivable
ALC [Member] | Commercial and Industrial Loans [Member]
Beginning balance
Charge-offs
Recoveries
Provision for loan losses
Ending balance
Individually evaluated for impairment
Collectively evaluated for impairment
Total allowance for loan losses
Individually evaluated for impairment
Collectively evaluated for impairment
Total loans receivable
ALC [Member] | Consumer Portfolio Segment [Member] | Consumer Loans [Member]
Beginning balance			1,653	1,717	1,717
Charge-offs			(1,213)		(2,297)
Recoveries			245		545
Provision for loan losses			1,038		1,688
Ending balance	1,723		1,723		1,653
Individually evaluated for impairment
Collectively evaluated for impairment						1,723	1,653
Total allowance for loan losses	1,723		1,653	1,717	1,653	1,723	1,653
Individually evaluated for impairment
Collectively evaluated for impairment						32,902	34,083
Total loans receivable						32,902	34,083
ALC [Member] | Consumer Portfolio Segment [Member] | Indirect Sales [Member]
Beginning balance			622	623	623
Charge-offs			(278)		(587)
Recoveries			54		98
Provision for loan losses			287		488
Ending balance	685		685		622
Individually evaluated for impairment
Collectively evaluated for impairment						685	622
Total allowance for loan losses	$ 685		$ 622	$ 623	$ 622	685	622
Individually evaluated for impairment
Collectively evaluated for impairment						67,429	55,071
Total loans receivable						$ 67,429	$ 55,071

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- Definition

Represents the amount of provision (reduction in reserve) for loan losses during the period.

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Amount of direct write-downs of accounts receivable charged against the allowance.

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Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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