Note 5 - Purchased Credit Impaired Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Real Estate Portfolio Segment [Member] | One-to-Four-Family Residential [Member]
PCI Loans	$ 2,951	$ 3,189	$ 4,049
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	2,951	3,189	4,049
Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member]
PCI Loans	9,446	9,886	9,299
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	9,446	9,886	9,299
Real Estate Portfolio Segment [Member] | Farmland [Member]
PCI Loans	62	70	84
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	62	70	84
Real Estate Portfolio Segment [Member] | Construction Loans [Member]
PCI Loans	1,932	2,127	3,212
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	1,932	2,127	3,212
Commercial Portfolio Segment [Member]
PCI Loans	586	1,012	1,130
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	586	1,012	1,130
Consumer Portfolio Segment [Member]
PCI Loans	62	63	84
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	62	63	84
PCI Loans	15,039	16,347	17,858
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	15,039	16,347	17,858
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	$ 19,313	$ 20,289	$ 20,913