Note 5 - Loans by Risk Categories (Details) - USD ($)	Jun. 30, 2016	Dec. 31, 2015
Real Estate Portfolio Segment [Member] | One-to-Four-Family Residential [Member] | Pass [Member]
Financing Receivable, Gross	$ 372,940,000	$ 384,193,000
Real Estate Portfolio Segment [Member] | One-to-Four-Family Residential [Member] | Special Mention [Member]
Financing Receivable, Gross	179,000	1,098,000
Real Estate Portfolio Segment [Member] | One-to-Four-Family Residential [Member] | Substandard [Member]
Financing Receivable, Gross	16,947,000	15,745,000
Real Estate Portfolio Segment [Member] | One-to-Four-Family Residential [Member]
Financing Receivable, Gross	390,066,000	401,036,000
Real Estate Portfolio Segment [Member] | Multifamily Residential [Member] | Pass [Member]
Financing Receivable, Gross	80,185,000	74,063,000
Real Estate Portfolio Segment [Member] | Multifamily Residential [Member] | Special Mention [Member]
Financing Receivable, Gross	0	0
Real Estate Portfolio Segment [Member] | Multifamily Residential [Member] | Substandard [Member]
Financing Receivable, Gross	149,000	163,000
Real Estate Portfolio Segment [Member] | Multifamily Residential [Member]
Financing Receivable, Gross	80,334,000	74,226,000
Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member] | Pass [Member]
Financing Receivable, Gross	454,468,000	462,552,000
Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member] | Special Mention [Member]
Financing Receivable, Gross	13,000	10,000
Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member] | Substandard [Member]
Financing Receivable, Gross	22,797,000	25,122,000
Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member]
Financing Receivable, Gross	477,278,000	487,684,000
Real Estate Portfolio Segment [Member] | Farmland [Member] | Pass [Member]
Financing Receivable, Gross	90,077,000	91,665,000
Real Estate Portfolio Segment [Member] | Farmland [Member] | Special Mention [Member]
Financing Receivable, Gross	0	1,095,000
Real Estate Portfolio Segment [Member] | Farmland [Member] | Substandard [Member]
Financing Receivable, Gross	2,375,000	1,475,000
Real Estate Portfolio Segment [Member] | Farmland [Member]
Financing Receivable, Gross	92,452,000	94,235,000
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Pass [Member]
Financing Receivable, Gross	123,133,000	114,534,000
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Special Mention [Member]
Financing Receivable, Gross	85,000	91,000
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Substandard [Member]
Financing Receivable, Gross	1,151,000	1,390,000
Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Gross	124,369,000	116,015,000
Commercial Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Gross	275,834,000	240,209,000
Commercial Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Gross	3,000	501,000
Commercial Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Gross	6,037,000	5,594,000
Commercial Portfolio Segment [Member]
Financing Receivable, Gross	281,874,000	246,304,000
Consumer Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Gross	35,979,000	38,283,000
Consumer Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Gross	0	12,000
Consumer Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Gross	360,000	299,000
Consumer Portfolio Segment [Member]
Financing Receivable, Gross	36,339,000	38,594,000
Pass [Member]
Financing Receivable, Gross	1,432,616,000	1,405,499,000
Special Mention [Member]
Financing Receivable, Gross	280,000	2,807,000
Substandard [Member]
Financing Receivable, Gross	49,816,000	49,788,000
Financing Receivable, Gross	$ 1,482,712,000	$ 1,458,094,000