Note 5 - Impaired Loans (Details) - USD ($)	Jun. 30, 2016	Dec. 31, 2015
Real Estate Portfolio Segment [Member] | One-to-Four-Family Residential [Member]
Impaired loans with a valuation allowance, unpaid principal balance	$ 249,000	$ 430,000
Impaired loans with a valuation allowance, recorded investment	234,000	312,000
Impaired loans, valuation allowance	77,000	83,000
Impaired loans without a valuation allowance, unpaid principal balance	9,866,000	7,605,000
Impaired loans without a valuation allowance, recorded investment	7,751,000	6,348,000
Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member]
Impaired loans with a valuation allowance, unpaid principal balance	895,000	2,728,000
Impaired loans with a valuation allowance, recorded investment	706,000	2,395,000
Impaired loans, valuation allowance	131,000	522,000
Impaired loans without a valuation allowance, unpaid principal balance	6,215,000	5,352,000
Impaired loans without a valuation allowance, recorded investment	4,913,000	4,243,000
Real Estate Portfolio Segment [Member] | Farmland [Member]
Impaired loans with a valuation allowance, unpaid principal balance	0	616,000
Impaired loans with a valuation allowance, recorded investment	0	473,000
Impaired loans, valuation allowance	0	112,000
Impaired loans without a valuation allowance, unpaid principal balance	1,255,000	796,000
Impaired loans without a valuation allowance, recorded investment	815,000	499,000
Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Impaired loans with a valuation allowance, unpaid principal balance	0	215,000
Impaired loans with a valuation allowance, recorded investment	0	211,000
Impaired loans, valuation allowance	0	89,000
Impaired loans without a valuation allowance, unpaid principal balance	755,000	686,000
Impaired loans without a valuation allowance, recorded investment	578,000	490,000
Commercial Portfolio Segment [Member]
Impaired loans with a valuation allowance, unpaid principal balance	3,269,000	1,153,000
Impaired loans with a valuation allowance, recorded investment	3,261,000	1,150,000
Impaired loans, valuation allowance	685,000	250,000
Impaired loans without a valuation allowance, unpaid principal balance	1,145,000	3,293,000
Impaired loans without a valuation allowance, recorded investment	935,000	3,085,000
Consumer Portfolio Segment [Member]
Impaired loans with a valuation allowance, unpaid principal balance	5,000	5,000
Impaired loans with a valuation allowance, recorded investment	5,000	5,000
Impaired loans, valuation allowance	5,000	5,000
Impaired loans without a valuation allowance, unpaid principal balance	246,000	188,000
Impaired loans without a valuation allowance, recorded investment	234,000	183,000
Multifamily Residential [Member]
Impaired loans without a valuation allowance, unpaid principal balance	156,000	282,000
Impaired loans without a valuation allowance, recorded investment	149,000	230,000
Impaired loans with a valuation allowance, unpaid principal balance	4,418,000	5,147,000
Impaired loans with a valuation allowance, recorded investment	4,206,000	4,546,000
Impaired loans, valuation allowance	898,000	1,061,000
Impaired loans without a valuation allowance, unpaid principal balance	19,638,000	18,202,000
Impaired loans without a valuation allowance, recorded investment	15,375,000	15,078,000
Total impaired loans	24,056,000	23,349,000
Total impaired loans	$ 19,581,000	$ 19,624,000