Note 6 - Loans and Allowance for Loan Losses - Schedule of Aging Analysis of Past Due Loans (Details) - USD ($)	Mar. 31, 2016	Dec. 31, 2015
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	$ 40,000	$ 0
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		0
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	$ 86,000	86,000
FUSB [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Total past due	126,000	86,000
Current	17,897,000	11,741,000
Total loans	$ 18,023,000	11,827,000
Accruing loans past due 90 days or more amounted		0
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	$ 69,000	118,000
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	25,000	206,000
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	463,000	360,000
FUSB [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Total past due	557,000	684,000
Current	30,066,000	30,046,000
Total loans	$ 30,623,000	30,730,000
Accruing loans past due 90 days or more amounted		0
FUSB [Member] | Real Estate [Member] | Secured by Multi-family Residential Properties [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Total past due		0
FUSB [Member] | Real Estate [Member] | Secured by Multi-family Residential Properties [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Total past due		0
FUSB [Member] | Real Estate [Member] | Secured by Multi-family Residential Properties [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Total past due		0
FUSB [Member] | Real Estate [Member] | Secured by Multi-family Residential Properties [Member]
Total past due		0
Current	$ 11,580,000	11,845,000
Total loans	$ 11,580,000	11,845,000
Accruing loans past due 90 days or more amounted		0
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		530,000
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		0
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	$ 148,000	148,000
FUSB [Member] | Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member]
Total past due	148,000	678,000
Current	82,606,000	83,205,000
Total loans	$ 82,754,000	83,883,000
Accruing loans past due 90 days or more amounted		0
FUSB [Member] | Real Estate [Member] | Other Real Estate Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Total past due		0
FUSB [Member] | Real Estate [Member] | Other Real Estate Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Total past due		0
FUSB [Member] | Real Estate [Member] | Other Real Estate Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Total past due		0
FUSB [Member] | Real Estate [Member] | Other Real Estate Loans [Member]
Total past due		0
Current	$ 168,000	115,000
Total loans	$ 168,000	115,000
Accruing loans past due 90 days or more amounted		0
FUSB [Member] | Commercial and Industrial Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Total past due	$ 73,000	22,000
FUSB [Member] | Commercial and Industrial Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Total past due	$ 38,000	52,000
FUSB [Member] | Commercial and Industrial Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Total past due		0
FUSB [Member] | Commercial and Industrial Loans [Member]
Total past due	$ 111,000	74,000
Current	34,457,000	29,303,000
Total loans	$ 34,568,000	29,377,000
Accruing loans past due 90 days or more amounted		0
FUSB [Member] | Consumer Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Total past due	$ 38,000	49,000
FUSB [Member] | Consumer Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Total past due		4,000
FUSB [Member] | Consumer Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Total past due	$ 22,000	83,000
FUSB [Member] | Consumer Portfolio Segment [Member]
Total past due	60,000	136,000
Current	6,554,000	6,921,000
Total loans	$ 6,614,000	7,057,000
Accruing loans past due 90 days or more amounted		0
FUSB [Member] | Other Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Total past due		0
FUSB [Member] | Other Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Total past due		0
FUSB [Member] | Other Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Total past due		0
FUSB [Member] | Other Loans [Member]
Total past due		0
Current	$ 407,000	379,000
Total loans	$ 407,000	379,000
Accruing loans past due 90 days or more amounted		0
FUSB [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Total past due	$ 220,000	719,000
FUSB [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Total past due	63,000	262,000
FUSB [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Total past due	719,000	677,000
FUSB [Member]
Total past due	1,002,000	1,658,000
Current	183,735,000	173,555,000
Total loans	$ 184,737,000	175,213,000
Accruing loans past due 90 days or more amounted		0
ALC [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Total past due		0
ALC [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Total past due		0
ALC [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		0
ALC [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Total past due		0
Current		$ 0
Total loans
Accruing loans past due 90 days or more amounted		$ 0
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	$ 25,000	91,000
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	15,000	206,000
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	392,000	252,000
ALC [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Total past due	432,000	549,000
Current	15,833,000	16,684,000
Total loans	$ 16,265,000	17,233,000
Accruing loans past due 90 days or more amounted		0
ALC [Member] | Real Estate [Member] | Secured by Multi-family Residential Properties [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Total past due		0
ALC [Member] | Real Estate [Member] | Secured by Multi-family Residential Properties [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Total past due		0
ALC [Member] | Real Estate [Member] | Secured by Multi-family Residential Properties [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Total past due		0
ALC [Member] | Real Estate [Member] | Secured by Multi-family Residential Properties [Member]
Total past due		0
Current		$ 0
Total loans
Accruing loans past due 90 days or more amounted		$ 0
ALC [Member] | Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Total past due		0
ALC [Member] | Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Total past due		0
ALC [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		0
ALC [Member] | Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member]
Total past due		0
Current		$ 0
Total loans
Accruing loans past due 90 days or more amounted		$ 0
ALC [Member] | Real Estate [Member] | Other Real Estate Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Total past due		0
ALC [Member] | Real Estate [Member] | Other Real Estate Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Total past due		0
ALC [Member] | Real Estate [Member] | Other Real Estate Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Total past due		0
ALC [Member] | Real Estate [Member] | Other Real Estate Loans [Member]
Total past due		0
Current		$ 0
Total loans
Accruing loans past due 90 days or more amounted		$ 0
ALC [Member] | Commercial and Industrial Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Total past due		0
ALC [Member] | Commercial and Industrial Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Total past due		0
ALC [Member] | Commercial and Industrial Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Total past due		0
ALC [Member] | Commercial and Industrial Loans [Member]
Total past due		0
Current		$ 0
Total loans
Accruing loans past due 90 days or more amounted		$ 0
ALC [Member] | Consumer Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Total past due	$ 659,000	965,000
ALC [Member] | Consumer Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Total past due	517,000	567,000
ALC [Member] | Consumer Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Total past due	1,394,000	1,377,000
ALC [Member] | Consumer Portfolio Segment [Member]
Total past due	2,570,000	2,909,000
Current	72,099,000	73,222,000
Total loans	$ 74,669,000	76,131,000
Accruing loans past due 90 days or more amounted		0
ALC [Member] | Other Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Total past due		0
ALC [Member] | Other Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Total past due		0
ALC [Member] | Other Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Total past due		0
ALC [Member] | Other Loans [Member]
Total past due		0
Current		$ 0
Total loans
Accruing loans past due 90 days or more amounted		$ 0
ALC [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Total past due	$ 684,000	1,056,000
ALC [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Total past due	532,000	773,000
ALC [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Total past due	1,786,000	1,629,000
ALC [Member]
Total past due	3,002,000	3,458,000
Current	87,932,000	89,906,000
Total loans	$ 90,934,000	93,364,000
Accruing loans past due 90 days or more amounted		0
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Total loans	$ 18,023,000	11,827,000
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Total loans	46,888,000	47,963,000
Real Estate [Member] | Secured by Multi-family Residential Properties [Member]
Total loans	11,580,000	11,845,000
Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member]
Total loans	82,754,000	83,883,000
Real Estate [Member] | Other Real Estate Loans [Member]
Total loans	168,000	115,000
Commercial and Industrial Loans [Member]
Total loans	34,568,000	29,377,000
Consumer Portfolio Segment [Member]
Total loans	81,283,000	83,188,000
Other Loans [Member]
Total loans	407,000	379,000
Total loans	$ 275,671,000	$ 268,577,000