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Note 4 - Loans and Allowance for Loan Losses - Changes in Allowance for Loan Losses and Recorded Investment in Loans (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Sep. 30, 2017
Dec. 31, 2016
Beginning balance     $ 4,856        
Provision (reduction in reserve) for loan losses $ 373 $ 680 1,464 $ 1,383      
Ending balance 4,808   4,808   $ 4,856    
Total allowance for loan losses 4,808   4,808   4,856 $ 4,808 $ 4,856
Total loans receivable           349,182 334,781
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]              
Total loans receivable           20,213 23,772
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]              
Total loans receivable           46,615 46,679
Real Estate [Member] | Secured by Multi-family Residential Properties [Member]              
Total loans receivable           16,498 16,627
Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member]              
Total loans receivable           107,679 102,112
Real Estate [Member] | Other Real Estate Loans [Member]              
Total loans receivable           223 234
Commercial and Industrial Loans [Member]              
Total loans receivable           66,320 57,963
Consumer Portfolio Segment [Member] | Consumer Loans [Member]              
Total loans receivable           41,081 42,619
Consumer Portfolio Segment [Member] | Indirect Sales [Member]              
Total loans receivable           50,553 44,775
FUSB [Member]              
Beginning balance     2,409 1,329 1,329    
Charge-offs     (79)   (151)    
Recoveries     222   346    
Provision (reduction in reserve) for loan losses     (130)   885    
Ending balance 2,422   2,422   2,409    
Individually evaluated for impairment           194 535
Collectively evaluated for impairment           2,228 1,874
Total allowance for loan losses 2,422   2,422 1,329 2,409 2,422 2,409
Individually evaluated for impairment           880 2,103
Collectively evaluated for impairment           250,609 237,766
Total loans receivable           251,489 239,869
FUSB [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]              
Beginning balance     535 110 110    
Charge-offs          
Recoveries       200    
Provision (reduction in reserve) for loan losses     (328)   225    
Ending balance 207   207   535    
Individually evaluated for impairment           62 423
Collectively evaluated for impairment           145 112
Total allowance for loan losses 207   535 110 535 207 535
Individually evaluated for impairment           86 1,361
Collectively evaluated for impairment           20,127 22,411
Total loans receivable           20,213 23,772
FUSB [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]              
Beginning balance     304 138 138    
Charge-offs       (66)    
Recoveries     85   23    
Provision (reduction in reserve) for loan losses     (141)   209    
Ending balance 248   248   304    
Individually evaluated for impairment           5 5
Collectively evaluated for impairment           243 299
Total allowance for loan losses 248   304 138 304 248 304
Individually evaluated for impairment           189 193
Collectively evaluated for impairment           34,936 32,762
Total loans receivable           35,125 32,955
FUSB [Member] | Real Estate [Member] | Secured by Multi-family Residential Properties [Member]              
Beginning balance     88 29 29    
Charge-offs          
Recoveries          
Provision (reduction in reserve) for loan losses     27   59    
Ending balance 115   115   88    
Individually evaluated for impairment          
Collectively evaluated for impairment           115 88
Total allowance for loan losses 115   88 29 88 115 88
Individually evaluated for impairment          
Collectively evaluated for impairment           16,498 16,627
Total loans receivable           16,498 16,627
FUSB [Member] | Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member]              
Beginning balance     903 351 351    
Charge-offs       (40)    
Recoveries     69      
Provision (reduction in reserve) for loan losses     (142)   592    
Ending balance 830   830   903    
Individually evaluated for impairment           55 107
Collectively evaluated for impairment           775 796
Total allowance for loan losses 830   903 351 903 830 903
Individually evaluated for impairment           535 549
Collectively evaluated for impairment           107,144 101,563
Total loans receivable           107,679 102,112
FUSB [Member] | Real Estate [Member] | Other Real Estate Loans [Member]              
Beginning balance     2 1 1    
Charge-offs          
Recoveries          
Provision (reduction in reserve) for loan losses       1    
Ending balance 2   2   2    
Individually evaluated for impairment          
Collectively evaluated for impairment           2 2
Total allowance for loan losses 2   2 1 2 2 2
Individually evaluated for impairment          
Collectively evaluated for impairment           223 234
Total loans receivable           223 234
FUSB [Member] | Commercial and Industrial Loans [Member]              
Beginning balance     527 659 659    
Charge-offs     (16)   (2)    
Recoveries     16   73    
Provision (reduction in reserve) for loan losses     440   (203)    
Ending balance 967   967   527    
Individually evaluated for impairment           72
Collectively evaluated for impairment           895 527
Total allowance for loan losses 967   527 659 527 967 527
Individually evaluated for impairment           70
Collectively evaluated for impairment           66,250 57,963
Total loans receivable           66,320 57,963
FUSB [Member] | Consumer Portfolio Segment [Member]              
Total loans receivable           5,431 6,206
FUSB [Member] | Consumer Portfolio Segment [Member] | Consumer Loans [Member]              
Beginning balance     50 41 41    
Charge-offs     (63)   (43)    
Recoveries     52   50    
Provision (reduction in reserve) for loan losses     14   2    
Ending balance 53   53   50    
Individually evaluated for impairment          
Collectively evaluated for impairment           53 50
Total allowance for loan losses 53   50 41 50 53 50
Individually evaluated for impairment          
Collectively evaluated for impairment           5,431 6,206
Total loans receivable           5,431 6,206
FUSB [Member] | Consumer Portfolio Segment [Member] | Indirect Sales [Member]              
Beginning balance        
Charge-offs          
Recoveries          
Provision (reduction in reserve) for loan losses          
Ending balance        
Individually evaluated for impairment          
Collectively evaluated for impairment          
Total allowance for loan losses  
Individually evaluated for impairment          
Collectively evaluated for impairment          
Total loans receivable          
ALC [Member]              
Beginning balance     2,447 2,452 2,452    
Charge-offs     (2,193)   (3,026)    
Recoveries     538   710    
Provision (reduction in reserve) for loan losses     1,594   2,311    
Ending balance 2,386   2,386   2,447    
Individually evaluated for impairment          
Collectively evaluated for impairment           2,386 2,447
Total allowance for loan losses 2,386   2,386 2,452 2,447 2,386 2,447
Individually evaluated for impairment          
Collectively evaluated for impairment           97,693 94,912
Total loans receivable           97,693 94,912
ALC [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]              
Beginning balance        
Charge-offs          
Recoveries          
Provision (reduction in reserve) for loan losses          
Ending balance        
Individually evaluated for impairment          
Collectively evaluated for impairment          
Total allowance for loan losses  
Individually evaluated for impairment          
Collectively evaluated for impairment          
Total loans receivable          
ALC [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]              
Beginning balance     107 250 250    
Charge-offs     (27)   (56)    
Recoveries     28   39    
Provision (reduction in reserve) for loan losses     (5)   (126)    
Ending balance 103   103   107    
Individually evaluated for impairment          
Collectively evaluated for impairment           103 107
Total allowance for loan losses 103   107 250 107 103 107
Individually evaluated for impairment          
Collectively evaluated for impairment           11,490 13,724
Total loans receivable           11,490 13,724
ALC [Member] | Real Estate [Member] | Secured by Multi-family Residential Properties [Member]              
Beginning balance        
Charge-offs          
Recoveries          
Provision (reduction in reserve) for loan losses          
Ending balance        
Individually evaluated for impairment          
Collectively evaluated for impairment          
Total allowance for loan losses  
Individually evaluated for impairment          
Collectively evaluated for impairment          
Total loans receivable          
ALC [Member] | Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member]              
Beginning balance        
Charge-offs          
Recoveries          
Provision (reduction in reserve) for loan losses          
Ending balance        
Individually evaluated for impairment          
Collectively evaluated for impairment          
Total allowance for loan losses  
Individually evaluated for impairment          
Collectively evaluated for impairment          
Total loans receivable          
ALC [Member] | Real Estate [Member] | Other Real Estate Loans [Member]              
Beginning balance        
Charge-offs          
Recoveries          
Provision (reduction in reserve) for loan losses          
Ending balance        
Individually evaluated for impairment          
Collectively evaluated for impairment          
Total allowance for loan losses  
Individually evaluated for impairment          
Collectively evaluated for impairment          
Total loans receivable          
ALC [Member] | Commercial and Industrial Loans [Member]              
Beginning balance        
Charge-offs          
Recoveries          
Provision (reduction in reserve) for loan losses          
Ending balance        
Individually evaluated for impairment          
Collectively evaluated for impairment          
Total allowance for loan losses  
Individually evaluated for impairment          
Collectively evaluated for impairment          
Total loans receivable          
ALC [Member] | Consumer Portfolio Segment [Member] | Consumer Loans [Member]              
Beginning balance     1,717 1,584 1,584    
Charge-offs     (1,721)   (2,218)    
Recoveries     435   451    
Provision (reduction in reserve) for loan losses     1,134   1,900    
Ending balance 1,565   1,565   1,717    
Individually evaluated for impairment          
Collectively evaluated for impairment           1,565 1,717
Total allowance for loan losses 1,565   1,717 1,584 1,717 1,565 1,717
Individually evaluated for impairment          
Collectively evaluated for impairment           35,650 36,413
Total loans receivable           35,650 36,413
ALC [Member] | Consumer Portfolio Segment [Member] | Indirect Sales [Member]              
Beginning balance     623 618 618    
Charge-offs     (445)   (752)    
Recoveries     75   220    
Provision (reduction in reserve) for loan losses     465   537    
Ending balance 718   718   623    
Individually evaluated for impairment          
Collectively evaluated for impairment           718 623
Total allowance for loan losses 718   623 618 623 718 623
Individually evaluated for impairment          
Collectively evaluated for impairment           50,553 44,775
Total loans receivable           50,553 44,775
FUSB and ALC [Member]              
Beginning balance     4,856 3,781 3,781    
Charge-offs     (2,272)   (3,177)    
Recoveries     760   1,056    
Provision (reduction in reserve) for loan losses     1,464   3,196    
Ending balance 4,808   4,808   4,856    
Individually evaluated for impairment           194 535
Collectively evaluated for impairment           4,614 4,321
Total allowance for loan losses 4,808   4,856 3,781 4,856 4,808 4,856
Individually evaluated for impairment           880 2,103
Collectively evaluated for impairment           348,302 332,678
Total loans receivable           349,182 334,781
FUSB and ALC [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]              
Beginning balance     535 110 110    
Charge-offs          
Recoveries       200    
Provision (reduction in reserve) for loan losses     (328)   225    
Ending balance 207   207   535    
Individually evaluated for impairment           62 423
Collectively evaluated for impairment           145 112
Total allowance for loan losses 207   535 110 535 207 535
Individually evaluated for impairment           86 1,361
Collectively evaluated for impairment           20,127 22,411
Total loans receivable           20,213 23,772
FUSB and ALC [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]              
Beginning balance     411 388 388    
Charge-offs     (27)   (122)    
Recoveries     113   62    
Provision (reduction in reserve) for loan losses     (146)   83    
Ending balance 351   351   411    
Individually evaluated for impairment           5 5
Collectively evaluated for impairment           346 406
Total allowance for loan losses 351   411 388 411 351 411
Individually evaluated for impairment           189 193
Collectively evaluated for impairment           46,426 46,486
Total loans receivable           46,615 46,679
FUSB and ALC [Member] | Real Estate [Member] | Secured by Multi-family Residential Properties [Member]              
Beginning balance     88 29 29    
Charge-offs          
Recoveries          
Provision (reduction in reserve) for loan losses     27   59    
Ending balance 115   115   88    
Individually evaluated for impairment          
Collectively evaluated for impairment           115 88
Total allowance for loan losses 115   88 29 88 115 88
Individually evaluated for impairment          
Collectively evaluated for impairment           16,498 16,627
Total loans receivable           16,498 16,627
FUSB and ALC [Member] | Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member]              
Beginning balance     903 351 351    
Charge-offs       (40)    
Recoveries     69      
Provision (reduction in reserve) for loan losses     (142)   592    
Ending balance 830   830   903    
Individually evaluated for impairment           55 107
Collectively evaluated for impairment           775 796
Total allowance for loan losses 830   903 351 903 830 903
Individually evaluated for impairment           535 549
Collectively evaluated for impairment           107,144 101,563
Total loans receivable           107,679 102,112
FUSB and ALC [Member] | Real Estate [Member] | Other Real Estate Loans [Member]              
Beginning balance     2 1 1    
Charge-offs          
Recoveries          
Provision (reduction in reserve) for loan losses       1    
Ending balance 2   2   2    
Individually evaluated for impairment          
Collectively evaluated for impairment           2 2
Total allowance for loan losses 2   2 1 2 2 2
Individually evaluated for impairment          
Collectively evaluated for impairment           223 234
Total loans receivable           223 234
FUSB and ALC [Member] | Commercial and Industrial Loans [Member]              
Beginning balance     527 659 659    
Charge-offs     (16)   (2)    
Recoveries     16   73    
Provision (reduction in reserve) for loan losses     440   (203)    
Ending balance 967   967   527    
Individually evaluated for impairment           72
Collectively evaluated for impairment           895 527
Total allowance for loan losses 967   527 659 527 967 527
Individually evaluated for impairment           70
Collectively evaluated for impairment           66,250 57,963
Total loans receivable           66,320 57,963
FUSB and ALC [Member] | Consumer Portfolio Segment [Member] | Consumer Loans [Member]              
Beginning balance     1,767 1,625 1,625    
Charge-offs     (1,784)   (2,261)    
Recoveries     487   501    
Provision (reduction in reserve) for loan losses     1,148   1,902    
Ending balance 1,618   1,618   1,767    
Individually evaluated for impairment          
Collectively evaluated for impairment           1,618 1,767
Total allowance for loan losses 1,618   1,767 1,625 1,767 1,618 1,767
Individually evaluated for impairment          
Collectively evaluated for impairment           41,081 42,619
Total loans receivable           41,081 42,619
FUSB and ALC [Member] | Consumer Portfolio Segment [Member] | Indirect Sales [Member]              
Beginning balance     623 618 618    
Charge-offs     (445)   (752)    
Recoveries     75   220    
Provision (reduction in reserve) for loan losses     465   537    
Ending balance 718   718   623    
Individually evaluated for impairment          
Collectively evaluated for impairment           718 623
Total allowance for loan losses $ 718   $ 623 $ 618 $ 623 718 623
Individually evaluated for impairment          
Collectively evaluated for impairment           50,553 44,775
Total loans receivable           $ 50,553 $ 44,775