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Note 5 - Loans and Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
		Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Mar. 31, 2019	Dec. 31, 2018
Beginning balance		$ 5,055	$ 4,774	$ 4,774
Charge-offs		(739)		(3,117)
Recoveries		208		776
Provision for loan and lease losses		400	658	2,622
Ending balance		4,924		5,055
Allowance for loan losses individually evaluated for impairment					$ 196	$ 166
Allowance for loan losses collectively evaluated for impairment					4,728	4,889
Loans, allowance for loan losses		4,924	4,774	5,055	4,924	5,055
Loans individually evaluated for impairment					1,954	1,042
Loans collectively evaluated for impairment					510,919	524,331
Loans					513,133	525,870
Financial Asset Acquired with Credit Deterioration [Member]
Beginning balance
Ending balance
Loans, allowance for loan losses
Loans					260	497
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Beginning balance		240	203	203
Charge-offs
Recoveries
Provision for loan and lease losses		(59)		37
Ending balance		181		240
Allowance for loan losses individually evaluated for impairment					98	28
Allowance for loan losses collectively evaluated for impairment					83	212
Loans, allowance for loan losses		240	203	240	181	240
Loans individually evaluated for impairment					421	153
Loans collectively evaluated for impairment					26,571	41,114
Loans					27,065	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	73
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Beginning balance		346	290	290
Charge-offs		(53)		(101)
Recoveries		9		74
Provision for loan and lease losses		79		83
Ending balance		381		346
Allowance for loan losses individually evaluated for impairment					16	50
Allowance for loan losses collectively evaluated for impairment					365	296
Loans, allowance for loan losses		346	290	346	381	346
Loans individually evaluated for impairment					919	268
Loans collectively evaluated for impairment					105,885	110,064
Loans					106,991	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					187	424
Real Estate [Member] | Secured by Multi-family Residential Properties [Member]
Beginning balance		128	116	116
Charge-offs
Recoveries
Provision for loan and lease losses		32		12
Ending balance		160		128
Allowance for loan losses individually evaluated for impairment
Allowance for loan losses collectively evaluated for impairment					160	128
Loans, allowance for loan losses		128	116	128	160	128
Loans individually evaluated for impairment
Loans collectively evaluated for impairment					27,602	23,009
Loans					27,602	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 and lease losses		(58)		50
Ending balance		773		831
Allowance for loan losses individually evaluated for impairment						1
Allowance for loan losses collectively evaluated for impairment					773	830
Loans, allowance for loan losses		831	777	831	773	831
Loans individually evaluated for impairment					510	511
Loans collectively evaluated for impairment					156,513	155,651
Loans					157,023	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 and lease losses				(1)
Ending balance		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	2	1	1	1
Loans individually evaluated for impairment
Loans collectively evaluated for impairment					949	1,308
Loans					949	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		1		11
Provision for loan and lease losses		44		81
Ending balance		1,183		1,138
Allowance for loan losses individually evaluated for impairment					66	67
Allowance for loan losses collectively evaluated for impairment					1,117	1,071
Loans, allowance for loan losses		1,138	1,049	1,138	1,183	1,138
Loans individually evaluated for impairment					66	67
Loans collectively evaluated for impairment					87,799	85,712
Loans	[1]				87,865	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		(536)		(2,482)
Recoveries		173		568
Provision for loan and lease losses		232		1,998
Ending balance		1,668		1,799
Allowance for loan losses individually evaluated for impairment					16	20
Allowance for loan losses collectively evaluated for impairment					1,652	1,779
Loans, allowance for loan losses		1,799	1,715	1,799	1,668	1,799
Loans individually evaluated for impairment					38	43
Loans collectively evaluated for impairment					36,254	38,540
Loans					36,292	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		(98)		(415)
Recoveries		25		113
Provision for loan and lease losses		55		336
Ending balance		409		427
Allowance for loan losses individually evaluated for impairment
Allowance for loan losses collectively evaluated for impairment					409	427
Loans, allowance for loan losses		427	393	427	409	427
Loans individually evaluated for impairment
Loans collectively evaluated for impairment					27,066	28,324
Loans					27,066	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		(52)		(116)
Recoveries				6
Provision for loan and lease losses		75		26
Ending balance		168		145
Allowance for loan losses individually evaluated for impairment
Allowance for loan losses collectively evaluated for impairment					168	145
Loans, allowance for loan losses		145	229	145	168	145
Loans individually evaluated for impairment
Loans collectively evaluated for impairment					42,280	40,609
Loans					42,280	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		(49)		(16)
Recoveries		25		89
Provision for loan and lease losses				215
Ending balance		2,711		2,735
Allowance for loan losses individually evaluated for impairment					196	166
Allowance for loan losses collectively evaluated for impairment					2,515	2,569
Loans, allowance for loan losses		2,711	2,447	2,735	2,711	2,735
Loans individually evaluated for impairment					1,748	831
Loans collectively evaluated for impairment					404,913	416,168
Loans					406,921	417,496
FUSB [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Beginning balance
Ending balance
Loans, allowance for loan losses
Loans					260	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 and lease losses		(59)		37
Ending balance		181		240
Allowance for loan losses individually evaluated for impairment					98	28
Allowance for loan losses collectively evaluated for impairment					83	212
Loans, allowance for loan losses		240	203	240	181	240
Loans individually evaluated for impairment					421	153
Loans collectively evaluated for impairment					26,571	41,114
Loans					27,065	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	73
FUSB [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Beginning balance		322	238	238
Charge-offs		(34)		(9)
Recoveries		6		51
Provision for loan and lease losses		61		42
Ending balance		355		322
Allowance for loan losses individually evaluated for impairment					16	50
Allowance for loan losses collectively evaluated for impairment					339	272
Loans, allowance for loan losses		322	238	322	355	322
Loans individually evaluated for impairment					713	57
Loans collectively evaluated for impairment					99,033	102,490
Loans					99,933	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					187	424
FUSB [Member] | Real Estate [Member] | Secured by Multi-family Residential Properties [Member]
Beginning balance		128	116	116
Charge-offs
Recoveries
Provision for loan and lease losses		32		12
Ending balance		160		128
Allowance for loan losses individually evaluated for impairment
Allowance for loan losses collectively evaluated for impairment					160	128
Loans, allowance for loan losses		128	116	128	160	128
Loans individually evaluated for impairment
Loans collectively evaluated for impairment					27,602	23,009
Loans					27,602	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 and lease losses		(58)		50
Ending balance		773		831
Allowance for loan losses individually evaluated for impairment						1
Allowance for loan losses collectively evaluated for impairment					773	830
Loans, allowance for loan losses		831	777	831	773	831
Loans individually evaluated for impairment					510	511
Loans collectively evaluated for impairment					156,513	155,651
Loans					157,023	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 and lease losses				(1)
Ending balance		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	2	1	1	1
Loans individually evaluated for impairment
Loans collectively evaluated for impairment					949	1,308
Loans					949	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		1		11
Provision for loan and lease losses		44		81
Ending balance		1,183		1,138
Allowance for loan losses individually evaluated for impairment					66	67
Allowance for loan losses collectively evaluated for impairment					1,117	1,071
Loans, allowance for loan losses		1,138	1,049	1,138	1,183	1,138
Loans individually evaluated for impairment					66	67
Loans collectively evaluated for impairment					87,799	85,712
Loans	[1]				87,865	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					6,484	6,927
FUSB [Member] | Consumer Portfolio Segment [Member] | Consumer Loans [Member]
Beginning balance		75	62	62
Charge-offs		(15)		(4)
Recoveries		18		23
Provision for loan and lease losses		(20)		(6)
Ending balance		58		75
Allowance for loan losses individually evaluated for impairment					16	20
Allowance for loan losses collectively evaluated for impairment					42	55
Loans, allowance for loan losses		75	62	75	58	75
Loans individually evaluated for impairment					38	43
Loans collectively evaluated for impairment					6,446	6,884
Loans					6,484	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 and lease 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 and lease 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		(690)		(3,101)
Recoveries		183		687
Provision for loan and lease losses		400		2,407
Ending balance		2,213		2,320
Allowance for loan losses individually evaluated for impairment
Allowance for loan losses collectively evaluated for impairment					2,213	2,320
Loans, allowance for loan losses		2,213	2,327	2,320	2,213	2,320
Loans individually evaluated for impairment					206	211
Loans collectively evaluated for impairment					106,006	108,163
Loans					106,212	108,374
ALC [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Beginning balance
Charge-offs
Recoveries
Provision for loan and lease 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		(19)		(92)
Recoveries		3		23
Provision for loan and lease losses		18		41
Ending balance		26		24
Allowance for loan losses individually evaluated for impairment
Allowance for loan losses collectively evaluated for impairment					26	24
Loans, allowance for loan losses		24	52	24	26	24
Loans individually evaluated for impairment					206	211
Loans collectively evaluated for impairment					6,852	7,574
Loans					7,058	7,785
ALC [Member] | Real Estate [Member] | Secured by Multi-family Residential Properties [Member]
Beginning balance
Charge-offs
Recoveries
Provision for loan and lease 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 and lease 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 and lease 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 and lease 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		(521)		(2,478)
Recoveries		155		545
Provision for loan and lease losses		252		2,004
Ending balance		1,610		1,724
Allowance for loan losses individually evaluated for impairment
Allowance for loan losses collectively evaluated for impairment					1,610	1,724
Loans, allowance for loan losses		1,724	1,653	1,724	1,610	1,724
Loans individually evaluated for impairment
Loans collectively evaluated for impairment					29,808	31,656
Loans					29,808	31,656
ALC [Member] | Consumer Portfolio Segment [Member] | Branch Retail [Member]
Beginning balance		427	393	393
Charge-offs		(98)		(415)
Recoveries		25		113
Provision for loan and lease losses		55		336
Ending balance		409		427
Allowance for loan losses individually evaluated for impairment
Allowance for loan losses collectively evaluated for impairment					409	427
Loans, allowance for loan losses		427	393	427	409	427
Loans individually evaluated for impairment
Loans collectively evaluated for impairment					27,066	28,324
Loans					27,066	28,324
ALC [Member] | Consumer Portfolio Segment [Member] | Indirect Sales [Member]
Beginning balance		145	229	229
Charge-offs		(52)		(116)
Recoveries				6
Provision for loan and lease losses		75		26
Ending balance		168		145
Allowance for loan losses individually evaluated for impairment
Allowance for loan losses collectively evaluated for impairment					168	145
Loans, allowance for loan losses		$ 145	$ 229	$ 145	168	145
Loans individually evaluated for impairment
Loans collectively evaluated for impairment					42,280	40,609
Loans					$ 42,280	$ 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.

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- 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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- 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)
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- 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
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-SubTopic 10
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-Paragraph 11B
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- 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)
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- 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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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
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- Definition

Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes 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 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522

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