Note 4 - Loans Receivable - Purchased Credit Impaired Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016
PCI Loans	$ 6,164	$ 12,384	$ 13,288
PCI Loans	8,652	15,468	17,676
Real Estate Portfolio Segment [Member] | One-to-Four-Family Residential [Member]
PCI Loans	2,265	2,714	2,833
Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member]
PCI Loans	1,858	7,576	8,353
Real Estate Portfolio Segment [Member] | Farmland [Member]
PCI Loans	29	53	58
Real Estate Portfolio Segment [Member] | Construction Loans [Member]
PCI Loans	1,445	1,432	1,419
Commercial Portfolio Segment [Member]
PCI Loans	524	556	570
Consumer Portfolio Segment [Member]
PCI Loans	$ 43	$ 53	$ 55