Note 5 - Loans Receivable (Details) - Loans by Risk Categories (USD $)	Mar. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	$ 1,039,877,000	$ 1,055,117,000
One-to-Four-Family Residential [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	226,240,000	231,002,000
One-to-Four-Family Residential [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	1,440,000	1,833,000
One-to-Four-Family Residential [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	11,656,000	11,792,000
One-to-Four-Family Residential [Member] | Not Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	75,810,000	75,862,000
One-to-Four-Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	315,146,000	320,489,000
Multifamily Residential [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	51,673,000	45,181,000
Multifamily Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	51,673,000	45,181,000
Nonfarm Nonresidential [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	316,177,000	349,672,000
Nonfarm Nonresidential [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	4,352,000	4,378,000
Nonfarm Nonresidential [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	14,935,000	15,585,000
Nonfarm Nonresidential [Member] | Not Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	906,000	339,000
Nonfarm Nonresidential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	336,370,000	369,974,000
Farmland [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	48,572,000	46,002,000
Farmland [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	1,192,000	1,197,000
Farmland [Member] | Not Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	480,000
Farmland [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	50,244,000	47,199,000
Construction and Land Development [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	96,239,000	93,841,000
Construction and Land Development [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	101,000	105,000
Construction and Land Development [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	2,350,000	2,375,000
Construction and Land Development [Member] | Not Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	2,228,000	2,273,000
Construction and Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	100,918,000	98,594,000
Commercial Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	137,549,000	135,547,000
Commercial Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	5,230,000	4,059,000
Commercial Loans [Member] | Not Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	10,134,000	265,000
Commercial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	152,913,000	139,871,000
Consumer Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	25,365,000	27,702,000
Consumer Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	6,000	6,000
Consumer Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	201,000	191,000
Consumer Loans [Member] | Not Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	7,041,000	5,910,000
Consumer Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	32,613,000	33,809,000
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	901,815,000	928,947,000
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	5,899,000	6,322,000
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	35,564,000	35,199,000
Not Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	$ 96,599,000	$ 84,649,000