Note 5 - Loans and Allowance for Loan Losses - Aging Analysis of Past Due Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2018		Dec. 31, 2017
Loans	$ 525,870		$ 357,458
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Loans	41,340		26,143
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Loans	110,756		45,073
Real Estate [Member] | Secured by Multi-family Residential Properties [Member]
Loans	23,009		16,579
Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member]
Loans	156,162		105,133
Real Estate [Member] | Other Real Estate Loans [Member]
Loans	1,308		190
Commercial and Industrial Loans [Member]
Loans	85,779	[1]	69,969
Consumer Portfolio Segment [Member] | Consumer Loans [Member]
Loans	38,583		39,300
Consumer Portfolio Segment [Member] | Branch Retail [Member]
Loans	28,324		26,434
Consumer Portfolio Segment [Member] | Indirect Sales [Member]
Loans	40,609		28,637
FUSB [Member]
Total past due	6,214		404
Current	411,282		257,099
Loans	417,496		257,503
Accruing loans past due 90 days or more amounted
FUSB [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Total past due	4,552		352
FUSB [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Total past due	661
FUSB [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Total past due	1,001		52
FUSB [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Total past due	1,071
Current	40,269		26,143
Loans	41,340		26,143
Accruing loans past due 90 days or more amounted
FUSB [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Total past due	415
FUSB [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Total past due	582
FUSB [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Total past due	74
FUSB [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Total past due	1,566		279
Current	101,405		33,993
Loans	102,971		34,272
Accruing loans past due 90 days or more amounted
FUSB [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Total past due	991		227
FUSB [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Total past due	36
FUSB [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Total past due	539		52
FUSB [Member] | Real Estate [Member] | Secured by Multi-family Residential Properties [Member]
Current	23,009		16,579
Loans	23,009		16,579
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		13
Current	155,691		105,120
Loans	156,162		105,133
Accruing loans past due 90 days or more amounted
FUSB [Member] | Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Total past due	458		13
FUSB [Member] | Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Total past due	13
FUSB [Member] | Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Total past due
FUSB [Member] | Real Estate [Member] | Other Real Estate Loans [Member]
Current	1,308		190
Loans	1,308		190
Accruing loans past due 90 days or more amounted
FUSB [Member] | Commercial and Industrial Loans [Member]
Total past due	3,022		70
Current	82,757		69,899
Loans	85,779	[1]	69,969
Accruing loans past due 90 days or more amounted
FUSB [Member] | Commercial and Industrial Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Total past due	2,608		70
FUSB [Member] | Commercial and Industrial Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Total past due	30
FUSB [Member] | Commercial and Industrial Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Total past due	384
FUSB [Member] | Consumer Portfolio Segment [Member]
Total past due	84		42
Current	6,843		5,175
Loans	6,927		5,217
Accruing loans past due 90 days or more amounted
FUSB [Member] | Consumer Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Total past due	80		42
FUSB [Member] | Consumer Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Total past due
FUSB [Member] | Consumer Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Total past due	4
FUSB [Member] | Consumer Portfolio Segment [Member] | Consumer Loans [Member]
Loans	6,927		5,217
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	2,796		3,242
Current	105,578		96,713
Loans	108,374		99,955
Accruing loans past due 90 days or more amounted
ALC [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Total past due	971		832
ALC [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Total past due	596		576
ALC [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Total past due	1,229		1,834
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	253		374
Current	7,532		10,427
Loans	7,785		10,801
Accruing loans past due 90 days or more amounted
ALC [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Total past due	60		61
ALC [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Total past due	65		23
ALC [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Total past due	128		290
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	1,747		1,924
Current	29,909		32,159
Loans	31,656		34,083
Accruing loans past due 90 days or more amounted
ALC [Member] | Consumer Portfolio Segment [Member] | Consumer Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Total past due	563		490
ALC [Member] | Consumer Portfolio Segment [Member] | Consumer Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Total past due	354		323
ALC [Member] | Consumer Portfolio Segment [Member] | Consumer Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Total past due	830		1,111
ALC [Member] | Consumer Portfolio Segment [Member] | Branch Retail [Member]
Total past due	415		570
Current	27,909		25,864
Loans	28,324		26,434
Accruing loans past due 90 days or more amounted
ALC [Member] | Consumer Portfolio Segment [Member] | Branch Retail [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Total past due	164		120
ALC [Member] | Consumer Portfolio Segment [Member] | Branch Retail [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Total past due	98		164
ALC [Member] | Consumer Portfolio Segment [Member] | Branch Retail [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Total past due	153		286
ALC [Member] | Consumer Portfolio Segment [Member] | Indirect Sales [Member]
Total past due	381		374
Current	40,228		28,263
Loans	40,609		28,637
Accruing loans past due 90 days or more amounted
ALC [Member] | Consumer Portfolio Segment [Member] | Indirect Sales [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Total past due	184		161
ALC [Member] | Consumer Portfolio Segment [Member] | Indirect Sales [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Total past due	79		66
ALC [Member] | Consumer Portfolio Segment [Member] | Indirect Sales [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Total past due	$ 118		$ 147

[1] Includes equipment financing leases.