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Note 4 - Loans and Allowance for Loan Losses - Changes in Allowance for Loan Losses and Recorded Investment in Loans (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Mar. 31, 2018	Dec. 31, 2017
Beginning balance	$ 4,774
Provision for loan losses	658	$ 515
Ending balance	4,829		$ 4,774
Total allowance for loan losses	4,829		4,774	$ 4,829	$ 4,774
Total loans receivable				365,003	357,458
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Total loans receivable				25,965	26,143
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Total loans receivable				46,581	45,073
Real Estate [Member] | Secured by Multi-family Residential Properties [Member]
Total loans receivable				16,396	16,579
Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member]
Total loans receivable				111,546	105,133
Real Estate [Member] | Other Real Estate Loans [Member]
Total loans receivable				188	190
Commercial and Industrial Loans [Member]
Total loans receivable				65,996	69,969
Consumer Portfolio Segment [Member] | Consumer Loans [Member]
Total loans receivable				38,174	39,300
Consumer Portfolio Segment [Member] | Indirect Sales [Member]
Total loans receivable				60,157	55,071
FUSB [Member]
Beginning balance	2,447	2,409	2,409
Charge-offs	(8)		(79)
Recoveries	22		247
Provision for loan losses	39		(130)
Ending balance	2,500		2,447
Individually evaluated for impairment				88	98
Collectively evaluated for impairment				2,412	2,349
Total allowance for loan losses	2,500	2,409	2,447	2,500	2,447
Individually evaluated for impairment				779	791
Collectively evaluated for impairment				261,346	256,712
Total loans receivable				262,125	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	(7)		(332)
Ending balance	196		203
Individually evaluated for impairment
Collectively evaluated for impairment				196	203
Total allowance for loan losses	203	535	203	196	203
Individually evaluated for impairment
Collectively evaluated for impairment				25,965	26,143
Total loans receivable				25,965	26,143
FUSB [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Beginning balance	238	304	304
Charge-offs	(8)
Recoveries	10		103
Provision for loan losses	14		(169)
Ending balance	254		238
Individually evaluated for impairment				5	5
Collectively evaluated for impairment				249	233
Total allowance for loan losses	238	304	238	254	238
Individually evaluated for impairment				186	187
Collectively evaluated for impairment				36,432	34,085
Total loans receivable				36,618	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	(1)		28
Ending balance	115		116
Individually evaluated for impairment
Collectively evaluated for impairment				115	116
Total allowance for loan losses	116	88	116	115	116
Individually evaluated for impairment
Collectively evaluated for impairment				16,396	16,579
Total loans receivable				16,396	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	18		(195)
Ending balance	798		777
Individually evaluated for impairment				14	21
Collectively evaluated for impairment				784	756
Total allowance for loan losses	777	903	777	798	777
Individually evaluated for impairment				524	532
Collectively evaluated for impairment				111,022	104,601
Total loans receivable				111,546	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
Individually evaluated for impairment
Collectively evaluated for impairment				2	2
Total allowance for loan losses	2	2	2	2	2
Individually evaluated for impairment
Collectively evaluated for impairment				188	190
Total loans receivable				188	190
FUSB [Member] | Commercial and Industrial Loans [Member]
Beginning balance	1,049	527	527
Charge-offs			(16)
Recoveries	5		19
Provision for loan losses	36		519
Ending balance	1,090		1,049
Individually evaluated for impairment				69	72
Collectively evaluated for impairment				1,021	977
Total allowance for loan losses	1,049	527	1,049	1,090	1,049
Individually evaluated for impairment				69	72
Collectively evaluated for impairment				65,927	69,897
Total loans receivable				65,996	69,969
FUSB [Member] | Consumer Portfolio Segment [Member]
Total loans receivable				5,416	5,217
FUSB [Member] | Consumer Portfolio Segment [Member] | Consumer Loans [Member]
Beginning balance	62	50	50
Charge-offs			(63)
Recoveries	4		56
Provision for loan losses	(21)		19
Ending balance	45		62
Individually evaluated for impairment
Collectively evaluated for impairment				45	62
Total allowance for loan losses	62	50	62	45	62
Individually evaluated for impairment
Collectively evaluated for impairment				5,416	5,217
Total loans receivable				5,416	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	(765)		(2,912)
Recoveries	148		675
Provision for loan losses	619		2,117
Ending balance	2,329		2,327
Individually evaluated for impairment
Collectively evaluated for impairment				2,329	2,327
Total allowance for loan losses	2,329	2,447	2,327	2,329	2,327
Individually evaluated for impairment
Collectively evaluated for impairment				102,878	99,955
Total loans receivable				102,878	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	(14)		(28)
Recoveries	5		32
Provision for loan losses	(7)		(59)
Ending balance	36		52
Individually evaluated for impairment
Collectively evaluated for impairment				36	52
Total allowance for loan losses	52	107	52	36	52
Individually evaluated for impairment
Collectively evaluated for impairment				9,963	10,801
Total loans receivable				9,963	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	(604)		(2,297)
Recoveries	122		545
Provision for loan losses	481		1,688
Ending balance	1,652		1,653
Individually evaluated for impairment
Collectively evaluated for impairment				1,652	1,653
Total allowance for loan losses	1,653	1,717	1,653	1,652	1,653
Individually evaluated for impairment
Collectively evaluated for impairment				32,758	34,083
Total loans receivable				32,758	34,083
ALC [Member] | Consumer Portfolio Segment [Member] | Indirect Sales [Member]
Beginning balance	622	623	623
Charge-offs	(147)		(587)
Recoveries	21		98
Provision for loan losses	145		488
Ending balance	641		622
Individually evaluated for impairment
Collectively evaluated for impairment				641	622
Total allowance for loan losses	622	623	622	641	622
Individually evaluated for impairment
Collectively evaluated for impairment				60,157	55,071
Total loans receivable				60,157	55,071
FUSB and ALC [Member]
Beginning balance	4,774	4,856	4,856
Charge-offs	(773)		(2,991)
Recoveries	170		922
Provision for loan losses	658		1,987
Ending balance	4,829		4,774
Individually evaluated for impairment				88	98
Collectively evaluated for impairment				4,741	4,676
Total allowance for loan losses	4,774	4,856	4,774	4,829	4,774
Individually evaluated for impairment				779	791
Collectively evaluated for impairment				364,224	356,667
Total loans receivable				365,003	357,458
FUSB and ALC [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Beginning balance	203	535	535
Charge-offs
Recoveries
Provision for loan losses	(7)		(332)
Ending balance	196		203
Individually evaluated for impairment
Collectively evaluated for impairment				196	203
Total allowance for loan losses	203	535	203	196	203
Individually evaluated for impairment
Collectively evaluated for impairment				25,965	26,143
Total loans receivable				25,965	26,143
FUSB and ALC [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Beginning balance	290	411	411
Charge-offs	(22)		(28)
Recoveries	15		135
Provision for loan losses	7		(228)
Ending balance	290		290
Individually evaluated for impairment				5	5
Collectively evaluated for impairment				285	285
Total allowance for loan losses	290	411	290	290	290
Individually evaluated for impairment				186	187
Collectively evaluated for impairment				46,395	44,886
Total loans receivable				46,581	45,073
FUSB and ALC [Member] | Real Estate [Member] | Secured by Multi-family Residential Properties [Member]
Beginning balance	116	88	88
Charge-offs
Recoveries
Provision for loan losses	(1)		28
Ending balance	115		116
Individually evaluated for impairment
Collectively evaluated for impairment				115	116
Total allowance for loan losses	116	88	116	115	116
Individually evaluated for impairment
Collectively evaluated for impairment				16,396	16,579
Total loans receivable				16,396	16,579
FUSB and ALC [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	18		(195)
Ending balance	798		777
Individually evaluated for impairment				14	21
Collectively evaluated for impairment				784	756
Total allowance for loan losses	777	903	777	798	777
Individually evaluated for impairment				524	532
Collectively evaluated for impairment				111,022	104,601
Total loans receivable				111,546	105,133
FUSB and ALC [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
Individually evaluated for impairment
Collectively evaluated for impairment				2	2
Total allowance for loan losses	2	2	2	2	2
Individually evaluated for impairment
Collectively evaluated for impairment				188	190
Total loans receivable				188	190
FUSB and ALC [Member] | Commercial and Industrial Loans [Member]
Beginning balance	1,049	527	527
Charge-offs			(16)
Recoveries	5		19
Provision for loan losses	36		519
Ending balance	1,090		1,049
Individually evaluated for impairment				69	72
Collectively evaluated for impairment				1,021	977
Total allowance for loan losses	1,049	527	1,049	1,090	1,049
Individually evaluated for impairment				69	72
Collectively evaluated for impairment				65,927	69,897
Total loans receivable				65,996	69,969
FUSB and ALC [Member] | Consumer Portfolio Segment [Member] | Consumer Loans [Member]
Beginning balance	1,715	1,767	1,767
Charge-offs	(604)		(2,360)
Recoveries	126		601
Provision for loan losses	460		1,707
Ending balance	1,697		1,715
Individually evaluated for impairment
Collectively evaluated for impairment				1,697	1,715
Total allowance for loan losses	1,715	1,767	1,715	1,697	1,715
Individually evaluated for impairment
Collectively evaluated for impairment				38,174	39,300
Total loans receivable				38,174	39,300
FUSB and ALC [Member] | Consumer Portfolio Segment [Member] | Indirect Sales [Member]
Beginning balance	622	623	623
Charge-offs	(147)		(587)
Recoveries	21		98
Provision for loan losses	145		488
Ending balance	641		622
Individually evaluated for impairment
Collectively evaluated for impairment				641	622
Total allowance for loan losses	$ 622	$ 623	$ 622	641	622
Individually evaluated for impairment
Collectively evaluated for impairment				60,157	55,071
Total loans receivable				$ 60,157	$ 55,071

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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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