Note 5 - Loans and Allowance for Loan Losses - Loans By Credit Quality Indicator (Details) - USD ($) $ in Thousands	Dec. 31, 2018		Dec. 31, 2017
Loans	$ 525,870		$ 357,458
FUSB [Member]
Loans	417,496		257,503
FUSB [Member] | Pass [Member]
Loans	408,188		248,610
FUSB [Member] | Special Mention [Member]
Loans	5,041		7,255
FUSB [Member] | Substandard [Member]
Loans	4,267		1,638
FUSB [Member] | Doubtful [Member]
Loans
ALC [Member]
Loans	108,374		99,955
ALC [Member] | Performing Financial Instruments [Member]
Loans	107,145		98,039
ALC [Member] | Nonperforming Financial Instruments [Member]
Loans	1,229		1,916
Consumer Portfolio Segment [Member] | FUSB [Member]
Loans	6,927		5,217
Consumer Portfolio Segment [Member] | FUSB [Member] | Pass [Member]
Loans	6,848		5,155
Consumer Portfolio Segment [Member] | FUSB [Member] | Special Mention [Member]
Loans
Consumer Portfolio Segment [Member] | FUSB [Member] | Substandard [Member]
Loans	79		62
Consumer Portfolio Segment [Member] | FUSB [Member] | Doubtful [Member]
Loans
Commercial and Industrial Loans [Member]
Loans	85,779	[1]	69,969
Commercial and Industrial Loans [Member] | FUSB [Member]
Loans	85,779	[1]	69,969
Commercial and Industrial Loans [Member] | FUSB [Member] | Pass [Member]
Loans	83,261		67,689
Commercial and Industrial Loans [Member] | FUSB [Member] | Special Mention [Member]
Loans	1,977		2,066
Commercial and Industrial Loans [Member] | FUSB [Member] | Substandard [Member]
Loans	541		214
Commercial and Industrial Loans [Member] | FUSB [Member] | Doubtful [Member]
Loans
Commercial and Industrial Loans [Member] | ALC [Member]
Loans		[1]
Construction, Land Development and Other Land Loans [Member] | Real Estate [Member]
Loans	41,340		26,143
Construction, Land Development and Other Land Loans [Member] | Real Estate [Member] | FUSB [Member]
Loans	41,340		26,143
Construction, Land Development and Other Land Loans [Member] | Real Estate [Member] | FUSB [Member] | Pass [Member]
Loans	40,200		25,872
Construction, Land Development and Other Land Loans [Member] | Real Estate [Member] | FUSB [Member] | Special Mention [Member]
Loans	914		84
Construction, Land Development and Other Land Loans [Member] | Real Estate [Member] | FUSB [Member] | Substandard [Member]
Loans	226		187
Construction, Land Development and Other Land Loans [Member] | Real Estate [Member] | FUSB [Member] | Doubtful [Member]
Loans
Construction, Land Development and Other Land Loans [Member] | Real Estate [Member] | ALC [Member]
Loans
Secured by 1-4 Family Residential Properties [Member] | Real Estate [Member]
Loans	110,756		45,073
Secured by 1-4 Family Residential Properties [Member] | Real Estate [Member] | FUSB [Member]
Loans	102,971		34,272
Secured by 1-4 Family Residential Properties [Member] | Real Estate [Member] | FUSB [Member] | Pass [Member]
Loans	100,485		33,278
Secured by 1-4 Family Residential Properties [Member] | Real Estate [Member] | FUSB [Member] | Special Mention [Member]
Loans	154		339
Secured by 1-4 Family Residential Properties [Member] | Real Estate [Member] | FUSB [Member] | Substandard [Member]
Loans	2,332		655
Secured by 1-4 Family Residential Properties [Member] | Real Estate [Member] | FUSB [Member] | Doubtful [Member]
Loans
Secured by 1-4 Family Residential Properties [Member] | Real Estate [Member] | ALC [Member]
Loans	7,785		10,801
Secured by 1-4 Family Residential Properties [Member] | Real Estate [Member] | ALC [Member] | Performing Financial Instruments [Member]
Loans	7,657		10,495
Secured by 1-4 Family Residential Properties [Member] | Real Estate [Member] | ALC [Member] | Nonperforming Financial Instruments [Member]
Loans	128		306
Consumer Loans [Member] | Consumer Portfolio Segment [Member]
Loans	38,583		39,300
Consumer Loans [Member] | Consumer Portfolio Segment [Member] | FUSB [Member]
Loans	6,927		5,217
Consumer Loans [Member] | Consumer Portfolio Segment [Member] | ALC [Member]
Loans	31,656		34,083
Consumer Loans [Member] | Consumer Portfolio Segment [Member] | ALC [Member] | Performing Financial Instruments [Member]
Loans	30,826		32,933
Consumer Loans [Member] | Consumer Portfolio Segment [Member] | ALC [Member] | Nonperforming Financial Instruments [Member]
Loans	830		1,150
Secured by Multi-family Residential Properties [Member] | Real Estate [Member]
Loans	23,009		16,579
Secured by Multi-family Residential Properties [Member] | Real Estate [Member] | FUSB [Member]
Loans	23,009		16,579
Secured by Multi-family Residential Properties [Member] | Real Estate [Member] | FUSB [Member] | Pass [Member]
Loans	23,009		16,579
Secured by Multi-family Residential Properties [Member] | Real Estate [Member] | FUSB [Member] | Special Mention [Member]
Loans
Secured by Multi-family Residential Properties [Member] | Real Estate [Member] | FUSB [Member] | Substandard [Member]
Loans
Secured by Multi-family Residential Properties [Member] | Real Estate [Member] | FUSB [Member] | Doubtful [Member]
Loans
Secured by Multi-family Residential Properties [Member] | Real Estate [Member] | ALC [Member]
Loans
Branch Retail [Member] | Consumer Portfolio Segment [Member]
Loans	28,324		26,434
Branch Retail [Member] | Consumer Portfolio Segment [Member] | FUSB [Member]
Loans
Branch Retail [Member] | Consumer Portfolio Segment [Member] | ALC [Member]
Loans	28,324		26,434
Branch Retail [Member] | Consumer Portfolio Segment [Member] | ALC [Member] | Performing Financial Instruments [Member]
Loans	28,171		26,121
Branch Retail [Member] | Consumer Portfolio Segment [Member] | ALC [Member] | Nonperforming Financial Instruments [Member]
Loans	153		313
Secured by Non-farm, Non-residential Properties [Member] | Real Estate [Member]
Loans	156,162		105,133
Secured by Non-farm, Non-residential Properties [Member] | Real Estate [Member] | FUSB [Member]
Loans	156,162		105,133
Secured by Non-farm, Non-residential Properties [Member] | Real Estate [Member] | FUSB [Member] | Pass [Member]
Loans	153,077		99,847
Secured by Non-farm, Non-residential Properties [Member] | Real Estate [Member] | FUSB [Member] | Special Mention [Member]
Loans	1,996		4,766
Secured by Non-farm, Non-residential Properties [Member] | Real Estate [Member] | FUSB [Member] | Substandard [Member]
Loans	1,089		520
Secured by Non-farm, Non-residential Properties [Member] | Real Estate [Member] | FUSB [Member] | Doubtful [Member]
Loans
Secured by Non-farm, Non-residential Properties [Member] | Real Estate [Member] | ALC [Member]
Loans
Indirect Sales [Member] | Consumer Portfolio Segment [Member]
Loans	40,609		28,637
Indirect Sales [Member] | Consumer Portfolio Segment [Member] | FUSB [Member]
Loans
Indirect Sales [Member] | Consumer Portfolio Segment [Member] | ALC [Member]
Loans	40,609		28,637
Indirect Sales [Member] | Consumer Portfolio Segment [Member] | ALC [Member] | Performing Financial Instruments [Member]
Loans	40,491		28,490
Indirect Sales [Member] | Consumer Portfolio Segment [Member] | ALC [Member] | Nonperforming Financial Instruments [Member]
Loans	118		147
Other Real Estate Loans [Member] | Real Estate [Member]
Loans	1,308		190
Other Real Estate Loans [Member] | Real Estate [Member] | FUSB [Member]
Loans	1,308		190
Other Real Estate Loans [Member] | Real Estate [Member] | FUSB [Member] | Pass [Member]
Loans	1,308		190
Other Real Estate Loans [Member] | Real Estate [Member] | FUSB [Member] | Special Mention [Member]
Loans
Other Real Estate Loans [Member] | Real Estate [Member] | FUSB [Member] | Substandard [Member]
Loans
Other Real Estate Loans [Member] | Real Estate [Member] | FUSB [Member] | Doubtful [Member]
Loans
Other Real Estate Loans [Member] | Real Estate [Member] | ALC [Member]
Loans

[1] Includes equipment financing leases.