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Note 5 - 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, 2019	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Jun. 30, 2019	Dec. 31, 2018
Beginning balance					$ 5,055	$ 4,774	$ 4,774
Charge-offs					(1,496)		(3,117)
Recoveries					413		776
Provision for loan losses		$ 715	$ 702	$ 702	1,115	1,360	2,622
Ending balance		5,087			5,087		5,055
Allowance for loan losses individually evaluated for impairment								$ 188	$ 166
Allowance for loan losses collectively evaluated for impairment								4,899	4,889
Loans, allowance for loan losses		5,087			5,087	4,774	5,055	5,087	5,055
Loans individually evaluated for impairment								2,166	1,042
Loans collectively evaluated for impairment								519,924	524,331
Loans								522,260	525,870
Financial Asset Acquired with Credit Deterioration [Member]
Beginning balance
Ending balance
Loans, allowance for loan losses
Loans								170	497
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Beginning balance					240	203	203
Charge-offs
Recoveries
Provision for loan losses					(50)		37
Ending balance		190			190		240
Allowance for loan losses individually evaluated for impairment								95	28
Allowance for loan losses collectively evaluated for impairment								95	212
Loans, allowance for loan losses		190			240	203	240	190	240
Loans individually evaluated for impairment								421	153
Loans collectively evaluated for impairment								27,100	41,114
Loans								27,521	41,340
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Beginning balance
Ending balance
Loans, allowance for loan losses
Loans									73
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Beginning balance					346	290	290
Charge-offs					(77)		(101)
Recoveries					15		74
Provision for loan losses					105		83
Ending balance		389			389		346
Allowance for loan losses individually evaluated for impairment								16	50
Allowance for loan losses collectively evaluated for impairment								373	296
Loans, allowance for loan losses		389			346	290	346	389	346
Loans individually evaluated for impairment								1,141	268
Loans collectively evaluated for impairment								102,043	110,064
Loans								103,354	110,756
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Beginning balance
Ending balance
Loans, allowance for loan losses
Loans								170	424
Real Estate [Member] | Secured by Multi-family Residential Properties [Member]
Beginning balance					128	116	116
Charge-offs
Recoveries
Provision for loan losses					38		12
Ending balance		166			166		128
Allowance for loan losses individually evaluated for impairment
Allowance for loan losses collectively evaluated for impairment								166	128
Loans, allowance for loan losses		166			128	116	128	166	128
Loans individually evaluated for impairment
Loans collectively evaluated for impairment								28,033	23,009
Loans								28,033	23,009
Real Estate [Member] | Secured by Multi-family Residential Properties [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Beginning balance
Ending balance
Loans, allowance for loan losses
Loans
Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member]
Beginning balance					831	777	777
Charge-offs
Recoveries							4
Provision for loan losses					(22)		50
Ending balance		809			809		831
Allowance for loan losses individually evaluated for impairment									1
Allowance for loan losses collectively evaluated for impairment								809	830
Loans, allowance for loan losses		809			831	777	831	809	831
Loans individually evaluated for impairment								504	511
Loans collectively evaluated for impairment								158,244	155,651
Loans								158,748	156,162
Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Beginning balance
Ending balance
Loans, allowance for loan losses
Loans
Real Estate [Member] | Other Real Estate Loans [Member]
Beginning balance					1	2	2
Charge-offs
Recoveries
Provision for loan losses							(1)
Ending balance		1			1		1
Allowance for loan losses individually evaluated for impairment
Allowance for loan losses collectively evaluated for impairment								1	1
Loans, allowance for loan losses		1			1	2	1	1	1
Loans individually evaluated for impairment
Loans collectively evaluated for impairment								880	1,308
Loans								880	1,308
Real Estate [Member] | Other Real Estate Loans [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Beginning balance
Ending balance
Loans, allowance for loan losses
Loans
Commercial and Industrial Loans [Member]
Beginning balance					1,138	1,049	1,049
Charge-offs							(3)
Recoveries					3		11
Provision for loan losses					63		81
Ending balance		1,204			1,204		1,138
Allowance for loan losses individually evaluated for impairment								65	67
Allowance for loan losses collectively evaluated for impairment								1,139	1,071
Loans, allowance for loan losses		1,204			1,138	1,049	1,138	1,204	1,138
Loans individually evaluated for impairment								65	67
Loans collectively evaluated for impairment								91,424	85,712
Loans	[1]							91,489	85,779
Commercial and Industrial Loans [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Beginning balance
Ending balance
Loans, allowance for loan losses
Loans
Consumer Portfolio Segment [Member] | Consumer Loans [Member]
Beginning balance					1,799	1,715	1,715
Charge-offs					(1,090)		(2,482)
Recoveries					334		568
Provision for loan losses					646		1,998
Ending balance		1,689			1,689		1,799
Allowance for loan losses individually evaluated for impairment								12	20
Allowance for loan losses collectively evaluated for impairment								1,677	1,779
Loans, allowance for loan losses		1,689			1,799	1,715	1,799	1,689	1,799
Loans individually evaluated for impairment								35	43
Loans collectively evaluated for impairment								37,125	38,540
Loans								37,160	38,583
Consumer Portfolio Segment [Member] | Consumer Loans [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Beginning balance
Ending balance
Loans, allowance for loan losses
Loans
Consumer Portfolio Segment [Member] | Branch Retail [Member]
Beginning balance					427	393	393
Charge-offs					(201)		(415)
Recoveries					59		113
Provision for loan losses					151		336
Ending balance		436			436		427
Allowance for loan losses individually evaluated for impairment
Allowance for loan losses collectively evaluated for impairment								436	427
Loans, allowance for loan losses		436			427	393	427	436	427
Loans individually evaluated for impairment
Loans collectively evaluated for impairment								29,609	28,324
Loans								29,609	28,324
Consumer Portfolio Segment [Member] | Branch Retail [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Beginning balance
Ending balance
Loans, allowance for loan losses
Loans
Consumer Portfolio Segment [Member] | Indirect Sales [Member]
Beginning balance					145	229	229
Charge-offs					(128)		(116)
Recoveries					2		6
Provision for loan losses					184		26
Ending balance		203			203		145
Allowance for loan losses individually evaluated for impairment
Allowance for loan losses collectively evaluated for impairment								203	145
Loans, allowance for loan losses		203			145	229	145	203	145
Loans individually evaluated for impairment
Loans collectively evaluated for impairment								45,466	40,609
Loans								45,466	40,609
Consumer Portfolio Segment [Member] | Indirect Sales [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Beginning balance
Ending balance
Loans, allowance for loan losses
Loans
FUSB [Member]
Beginning balance					2,735	2,447	2,447
Charge-offs					(62)		(16)
Recoveries					35		89
Provision for loan losses					90		215
Ending balance		2,798			2,798		2,735
Allowance for loan losses individually evaluated for impairment								188	166
Allowance for loan losses collectively evaluated for impairment								2,610	2,569
Loans, allowance for loan losses		2,798			2,798	2,447	2,735	2,798	2,735
Loans individually evaluated for impairment								1,972	831
Loans collectively evaluated for impairment								408,575	416,168
Loans								410,717	417,496
FUSB [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Beginning balance
Ending balance
Loans, allowance for loan losses
Loans								170	497
FUSB [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Beginning balance					240	203	203
Charge-offs
Recoveries
Provision for loan losses					(50)		37
Ending balance		190			190		240
Allowance for loan losses individually evaluated for impairment								95	28
Allowance for loan losses collectively evaluated for impairment								95	212
Loans, allowance for loan losses		190			240	203	240	190	240
Loans individually evaluated for impairment								421	153
Loans collectively evaluated for impairment								27,100	41,114
Loans								27,521	41,340
FUSB [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Beginning balance
Ending balance
Loans, allowance for loan losses
Loans									73
FUSB [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Beginning balance					322	238	238
Charge-offs					(47)		(9)
Recoveries					9		51
Provision for loan losses					77		42
Ending balance		361			361		322
Allowance for loan losses individually evaluated for impairment								16	50
Allowance for loan losses collectively evaluated for impairment								345	272
Loans, allowance for loan losses		361			322	238	322	361	322
Loans individually evaluated for impairment								947	57
Loans collectively evaluated for impairment								95,688	102,490
Loans								96,805	102,971
FUSB [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Beginning balance
Ending balance
Loans, allowance for loan losses
Loans								170	424
FUSB [Member] | Real Estate [Member] | Secured by Multi-family Residential Properties [Member]
Beginning balance					128	116	116
Charge-offs
Recoveries
Provision for loan losses					38		12
Ending balance		166			166		128
Allowance for loan losses individually evaluated for impairment
Allowance for loan losses collectively evaluated for impairment								166	128
Loans, allowance for loan losses		166			128	116	128	166	128
Loans individually evaluated for impairment
Loans collectively evaluated for impairment								28,033	23,009
Loans								28,033	23,009
FUSB [Member] | Real Estate [Member] | Secured by Multi-family Residential Properties [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Beginning balance
Ending balance
Loans, allowance for loan losses
Loans
FUSB [Member] | Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member]
Beginning balance					831	777	777
Charge-offs
Recoveries							4
Provision for loan losses					(22)		50
Ending balance		809			809		831
Allowance for loan losses individually evaluated for impairment									1
Allowance for loan losses collectively evaluated for impairment								809	830
Loans, allowance for loan losses		809			831	777	831	809	831
Loans individually evaluated for impairment								504	511
Loans collectively evaluated for impairment								158,244	155,651
Loans								158,748	156,162
FUSB [Member] | Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Beginning balance
Ending balance
Loans, allowance for loan losses
Loans
FUSB [Member] | Real Estate [Member] | Other Real Estate Loans [Member]
Beginning balance					1	2	2
Charge-offs
Recoveries
Provision for loan losses							(1)
Ending balance		1			1		1
Allowance for loan losses individually evaluated for impairment
Allowance for loan losses collectively evaluated for impairment								1	1
Loans, allowance for loan losses		1			1	2	1	1	1
Loans individually evaluated for impairment
Loans collectively evaluated for impairment								880	1,308
Loans								880	1,308
FUSB [Member] | Real Estate [Member] | Other Real Estate Loans [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Beginning balance
Ending balance
Loans, allowance for loan losses
Loans
FUSB [Member] | Commercial and Industrial Loans [Member]
Beginning balance					1,138	1,049	1,049
Charge-offs							(3)
Recoveries					3		11
Provision for loan losses					63		81
Ending balance		1,204			1,204		1,138
Allowance for loan losses individually evaluated for impairment								65	67
Allowance for loan losses collectively evaluated for impairment								1,139	1,071
Loans, allowance for loan losses		1,204			1,138	1,049	1,138	1,204	1,138
Loans individually evaluated for impairment								65	67
Loans collectively evaluated for impairment								91,424	85,712
Loans	[1]							91,489	85,779
FUSB [Member] | Commercial and Industrial Loans [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Beginning balance
Ending balance
Loans, allowance for loan losses
Loans
FUSB [Member] | Consumer Portfolio Segment [Member]
Loans								7,241	6,927
FUSB [Member] | Consumer Portfolio Segment [Member] | Consumer Loans [Member]
Beginning balance					75	62	62
Charge-offs					(15)		(4)
Recoveries					23		23
Provision for loan losses					(16)		(6)
Ending balance		67			67		75
Allowance for loan losses individually evaluated for impairment								12	20
Allowance for loan losses collectively evaluated for impairment								55	55
Loans, allowance for loan losses		67			75	62	75	67	75
Loans individually evaluated for impairment								35	43
Loans collectively evaluated for impairment								7,206	6,884
Loans								7,241	6,927
FUSB [Member] | Consumer Portfolio Segment [Member] | Consumer Loans [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Beginning balance
Ending balance
Loans, allowance for loan losses
Loans
FUSB [Member] | Consumer Portfolio Segment [Member] | Branch Retail [Member]
Beginning balance
Charge-offs
Recoveries
Provision for loan losses
Ending balance
Allowance for loan losses individually evaluated for impairment
Allowance for loan losses collectively evaluated for impairment
Loans, allowance for loan losses
Loans individually evaluated for impairment
Loans collectively evaluated for impairment
Loans
FUSB [Member] | Consumer Portfolio Segment [Member] | Branch Retail [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Beginning balance
Ending balance
Loans, allowance for loan losses
Loans
FUSB [Member] | Consumer Portfolio Segment [Member] | Indirect Sales [Member]
Beginning balance
Charge-offs
Recoveries
Provision for loan losses
Ending balance
Allowance for loan losses individually evaluated for impairment
Allowance for loan losses collectively evaluated for impairment
Loans, allowance for loan losses
Loans individually evaluated for impairment
Loans collectively evaluated for impairment
Loans
FUSB [Member] | Consumer Portfolio Segment [Member] | Indirect Sales [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Beginning balance
Ending balance
Loans, allowance for loan losses
Loans
ALC [Member]
Beginning balance					2,320	2,327	2,327
Charge-offs					(1,434)		(3,101)
Recoveries					378		687
Provision for loan losses					1,025		2,407
Ending balance		2,289			2,289		2,320
Allowance for loan losses individually evaluated for impairment
Allowance for loan losses collectively evaluated for impairment								2,289	2,320
Loans, allowance for loan losses		2,289			2,289	2,327	2,320	2,289	2,320
Loans individually evaluated for impairment								194	211
Loans collectively evaluated for impairment								111,349	108,163
Loans								111,543	108,374
ALC [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Beginning balance
Charge-offs
Recoveries
Provision for loan losses
Ending balance
Allowance for loan losses individually evaluated for impairment
Allowance for loan losses collectively evaluated for impairment
Loans, allowance for loan losses
Loans individually evaluated for impairment
Loans collectively evaluated for impairment
Loans
ALC [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Beginning balance					24	52	52
Charge-offs					(30)		(92)
Recoveries					6		23
Provision for loan losses					28		41
Ending balance		28			28		24
Allowance for loan losses individually evaluated for impairment
Allowance for loan losses collectively evaluated for impairment								28	24
Loans, allowance for loan losses		28			24	52	24	28	24
Loans individually evaluated for impairment								194	211
Loans collectively evaluated for impairment								6,355	7,574
Loans								6,549	7,785
ALC [Member] | Real Estate [Member] | Secured by Multi-family Residential Properties [Member]
Beginning balance
Charge-offs
Recoveries
Provision for loan losses
Ending balance
Allowance for loan losses individually evaluated for impairment
Allowance for loan losses collectively evaluated for impairment
Loans, allowance for loan losses
Loans individually evaluated for impairment
Loans collectively evaluated for impairment
Loans
ALC [Member] | Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member]
Beginning balance
Charge-offs
Recoveries
Provision for loan losses
Ending balance
Allowance for loan losses individually evaluated for impairment
Allowance for loan losses collectively evaluated for impairment
Loans, allowance for loan losses
Loans individually evaluated for impairment
Loans collectively evaluated for impairment
Loans
ALC [Member] | Real Estate [Member] | Other Real Estate Loans [Member]
Beginning balance
Charge-offs
Recoveries
Provision for loan losses
Ending balance
Allowance for loan losses individually evaluated for impairment
Allowance for loan losses collectively evaluated for impairment
Loans, allowance for loan losses
Loans individually evaluated for impairment
Loans collectively evaluated for impairment
Loans
ALC [Member] | Commercial and Industrial Loans [Member]
Beginning balance
Charge-offs
Recoveries
Provision for loan losses
Ending balance
Allowance for loan losses individually evaluated for impairment
Allowance for loan losses collectively evaluated for impairment
Loans, allowance for loan losses
Loans individually evaluated for impairment
Loans collectively evaluated for impairment
Loans	[1]
ALC [Member] | Consumer Portfolio Segment [Member] | Consumer Loans [Member]
Beginning balance					1,724	1,653	1,653
Charge-offs					(1,075)		(2,478)
Recoveries					311		545
Provision for loan losses					662		2,004
Ending balance		1,622			1,622		1,724
Allowance for loan losses individually evaluated for impairment
Allowance for loan losses collectively evaluated for impairment								1,622	1,724
Loans, allowance for loan losses		1,622			1,724	1,653	1,724	1,622	1,724
Loans individually evaluated for impairment
Loans collectively evaluated for impairment								29,919	31,656
Loans								29,919	31,656
ALC [Member] | Consumer Portfolio Segment [Member] | Branch Retail [Member]
Beginning balance					427	393	393
Charge-offs					(201)		(415)
Recoveries					59		113
Provision for loan losses					151		336
Ending balance		436			436		427
Allowance for loan losses individually evaluated for impairment
Allowance for loan losses collectively evaluated for impairment								436	427
Loans, allowance for loan losses		436			427	393	427	436	427
Loans individually evaluated for impairment
Loans collectively evaluated for impairment								29,609	28,324
Loans								29,609	28,324
ALC [Member] | Consumer Portfolio Segment [Member] | Indirect Sales [Member]
Beginning balance					145	229	229
Charge-offs					(128)		(116)
Recoveries					2		6
Provision for loan losses					184		26
Ending balance		203			203		145
Allowance for loan losses individually evaluated for impairment
Allowance for loan losses collectively evaluated for impairment								203	145
Loans, allowance for loan losses		$ 203			$ 145	$ 229	$ 145	203	145
Loans individually evaluated for impairment
Loans collectively evaluated for impairment								45,466	40,609
Loans								$ 45,466	$ 40,609
[1] Includes equipment financing leases.

X

- Definition

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

+ References

No definition available.

+ Details

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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447

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X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(4)
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X

- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524

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X

- Definition

Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524

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X

- Definition

The balance of financing receivables that were collectively evaluated for impairment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524

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X

- Definition

The balance of financing receivables that were individually evaluated for impairment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524

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Period Type:	instant

X

- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(d))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
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