Note 5 - Purchased Credit Impaired Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Real Estate Portfolio Segment [Member] | One-to-Four-Family Residential [Member]
PCI Loans	$ 3,128	$ 3,189	$ 4,208
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	3,128	3,189	4,208
Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member]
PCI Loans	9,634	9,886	9,106
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	9,634	9,886	9,106
Real Estate Portfolio Segment [Member] | Farmland [Member]
PCI Loans	66	70	86
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	66	70	86
Real Estate Portfolio Segment [Member] | Construction Loans [Member]
PCI Loans	2,088	2,127	3,300
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	2,088	2,127	3,300
Commercial Portfolio Segment [Member]
PCI Loans	1,005	1,012	1,502
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	1,005	1,012	1,502
Consumer Portfolio Segment [Member]
PCI Loans	60	63	111
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	60	63	111
PCI Loans	15,981	16,347	18,313
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	15,981	16,347	18,313
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	$ 19,917	$ 20,289	$ 21,492