Note 5 - Loans Receivable - Purchased Credit Impaired Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Jun. 13, 2014
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	$ 12,384	$ 16,347	$ 21,105
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	15,468	20,289	26,942
Real Estate Portfolio Segment [Member] | One-to-Four-Family Residential [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	2,714	3,189	4,728
Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	7,576	9,886	10,790
Real Estate Portfolio Segment [Member] | Farmland [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	53	70	95
Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	1,432	2,127	3,432
Commercial Portfolio Segment [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	556	1,012	1,882
Consumer Portfolio Segment [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	$ 53	$ 63	$ 178