Note 5 - Loans and Allowance for Loan Losses - Aging Analysis of Past Due Loans (Details) - USD ($) $ in Thousands		Mar. 31, 2019	Dec. 31, 2018
Loans		$ 513,133	$ 525,870
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Loans		27,065	41,340
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Loans		106,991	110,756
Real Estate [Member] | Secured by Multi-family Residential Properties [Member]
Loans		27,602	23,009
Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member]
Loans		157,023	156,162
Real Estate [Member] | Other Real Estate Loans [Member]
Loans		949	1,308
Commercial and Industrial Loans [Member]
Loans	[1]	87,865	85,779
Consumer Portfolio Segment [Member] | Consumer Loans [Member]
Loans		36,292	38,583
Consumer Portfolio Segment [Member] | Branch Retail [Member]
Loans		27,066	28,324
Consumer Portfolio Segment [Member] | Indirect Sales [Member]
Loans		42,280	40,609
FUSB [Member]
Total past due		1,311	6,214
Current		405,610	411,282
Loans		406,921	417,496
Accruing loans past due 90 days or more amounted
FUSB [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Total past due		1,155	4,552
FUSB [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Total past due		23	661
FUSB [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total past due		133	1,001
FUSB [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Total past due		243	1,071
Current		26,822	40,269
Loans		27,065	41,340
Accruing loans past due 90 days or more amounted
FUSB [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Total past due		170	415
FUSB [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Total past due			582
FUSB [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total past due		73	74
FUSB [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Total past due		444	1,566
Current		99,489	101,405
Loans		99,933	102,971
Accruing loans past due 90 days or more amounted
FUSB [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Total past due		403	991
FUSB [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Total past due			36
FUSB [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total past due		41	539
FUSB [Member] | Real Estate [Member] | Secured by Multi-family Residential Properties [Member]
Current		27,602	23,009
Loans		27,602	23,009
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		471	471
Current		156,552	155,691
Loans		157,023	156,162
Accruing loans past due 90 days or more amounted
FUSB [Member] | Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Total past due		471	458
FUSB [Member] | Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Total past due			13
FUSB [Member] | Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total past due
FUSB [Member] | Real Estate [Member] | Other Real Estate Loans [Member]
Current		949	1,308
Loans		949	1,308
Accruing loans past due 90 days or more amounted
FUSB [Member] | Commercial and Industrial Loans [Member]
Total past due		100	3,022
Current		87,765	82,757
Loans	[1]	87,865	85,779
Accruing loans past due 90 days or more amounted
FUSB [Member] | Commercial and Industrial Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Total past due		77	2,608
FUSB [Member] | Commercial and Industrial Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Total past due		23	30
FUSB [Member] | Commercial and Industrial Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total past due			384
FUSB [Member] | Consumer Portfolio Segment [Member]
Total past due		53	84
Current		6,431	6,843
Loans		6,484	6,927
Accruing loans past due 90 days or more amounted
FUSB [Member] | Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Total past due		34	80
FUSB [Member] | Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Total past due
FUSB [Member] | Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total past due		19	4
FUSB [Member] | Consumer Portfolio Segment [Member] | Consumer Loans [Member]
Loans		6,484	6,927
FUSB [Member] | Consumer Portfolio Segment [Member] | Branch Retail [Member]
Loans
FUSB [Member] | Consumer Portfolio Segment [Member] | Indirect Sales [Member]
Loans
ALC [Member]
Total past due		2,471	2,796
Current		103,741	105,578
Loans		106,212	108,374
Accruing loans past due 90 days or more amounted
ALC [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Total past due		937	971
ALC [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Total past due		419	596
ALC [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total past due		1,115	1,229
ALC [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
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		163	253
Current		6,895	7,532
Loans		7,058	7,785
Accruing loans past due 90 days or more amounted
ALC [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Total past due		58	60
ALC [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Total past due		1	65
ALC [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total past due		104	128
ALC [Member] | Real Estate [Member] | Secured by Multi-family Residential Properties [Member]
Current
Loans
Accruing loans past due 90 days or more amounted
ALC [Member] | Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member]
Current
Loans
Accruing loans past due 90 days or more amounted
ALC [Member] | Real Estate [Member] | Other Real Estate Loans [Member]
Current
Loans
Accruing loans past due 90 days or more amounted
ALC [Member] | Commercial and Industrial Loans [Member]
Current
Loans	[1]
Accruing loans past due 90 days or more amounted
ALC [Member] | Consumer Portfolio Segment [Member] | Consumer Loans [Member]
Total past due		1,367	1,747
Current		28,441	29,909
Loans		29,808	31,656
Accruing loans past due 90 days or more amounted
ALC [Member] | Consumer Portfolio Segment [Member] | Consumer Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Total past due		416	563
ALC [Member] | Consumer Portfolio Segment [Member] | Consumer Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Total past due		257	354
ALC [Member] | Consumer Portfolio Segment [Member] | Consumer Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total past due		694	830
ALC [Member] | Consumer Portfolio Segment [Member] | Branch Retail [Member]
Total past due		380	415
Current		26,686	27,909
Loans		27,066	28,324
Accruing loans past due 90 days or more amounted
ALC [Member] | Consumer Portfolio Segment [Member] | Branch Retail [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Total past due		126	164
ALC [Member] | Consumer Portfolio Segment [Member] | Branch Retail [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Total past due		127	98
ALC [Member] | Consumer Portfolio Segment [Member] | Branch Retail [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total past due		127	153
ALC [Member] | Consumer Portfolio Segment [Member] | Indirect Sales [Member]
Total past due		561	381
Current		41,719	40,228
Loans		42,280	40,609
Accruing loans past due 90 days or more amounted
ALC [Member] | Consumer Portfolio Segment [Member] | Indirect Sales [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Total past due		337	184
ALC [Member] | Consumer Portfolio Segment [Member] | Indirect Sales [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Total past due		34	79
ALC [Member] | Consumer Portfolio Segment [Member] | Indirect Sales [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total past due		$ 190	$ 118

[1] Includes equipment financing leases.