Note 5 - Loans Receivable (Details) - Troubled Debt Restructurings (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Modifications [Line Items]
Number of loans	3	4
Balance	$ 2,500	$ 2,600
Accruing Troubled Debt Restructurings [Member] | One-to-Four-Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Number of loans	4	4
Balance	482	495
Accruing Troubled Debt Restructurings [Member] | Construction and Land Development [Member]
Financing Receivable, Modifications [Line Items]
Number of loans	1
Balance	84
Accruing Troubled Debt Restructurings [Member]
Financing Receivable, Modifications [Line Items]
Number of loans	5	4
Balance	566	495
Nonaccrual Troubled Debt Restructurings [Member] | One-to-Four-Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Number of loans	9	8
Balance	726	658
Nonaccrual Troubled Debt Restructurings [Member] | Nonfarm Nonresidential [Member]
Financing Receivable, Modifications [Line Items]
Number of loans	3	3
Balance	511	556
Nonaccrual Troubled Debt Restructurings [Member] | Farmland [Member]
Financing Receivable, Modifications [Line Items]
Number of loans	1	1
Balance	250	287
Nonaccrual Troubled Debt Restructurings [Member] | Construction and Land Development [Member]
Financing Receivable, Modifications [Line Items]
Number of loans	2	4
Balance	396	569
Nonaccrual Troubled Debt Restructurings [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Number of loans	2	1
Balance	15	5
Nonaccrual Troubled Debt Restructurings [Member]
Financing Receivable, Modifications [Line Items]
Number of loans	17	17
Balance	1,898	2,075
Troubled Debt Restructuring [Member] | One-to-Four-Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Number of loans	13	12
Balance	1,208	1,153
Troubled Debt Restructuring [Member] | Nonfarm Nonresidential [Member]
Financing Receivable, Modifications [Line Items]
Number of loans	3	3
Balance	511	556
Troubled Debt Restructuring [Member] | Farmland [Member]
Financing Receivable, Modifications [Line Items]
Number of loans	1	1
Balance	250	287
Troubled Debt Restructuring [Member] | Construction and Land Development [Member]
Financing Receivable, Modifications [Line Items]
Number of loans	3	4
Balance	480	569
Troubled Debt Restructuring [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Number of loans	2	1
Balance	15	5
Troubled Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Number of loans	22	21
Balance	$ 2,464	$ 2,570