Note 4 - Loans Receivable (Detail) - Impaired Loans (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Unpaid Principal Balance [Member] | One-to-Four-Family Residential [Member]
Impaired loans with a valuation allowance unpaid principal balance	$ 1,462	$ 3,019	$ 1,462	$ 3,019
Impaired loans without a valuation allowance unpaid principal balance	6,914	10,066	6,914	10,066
Unpaid Principal Balance [Member] | Home Equity and Second Mortgage [Member]
Impaired loans with a valuation allowance unpaid principal balance	212	108	212	108
Impaired loans without a valuation allowance unpaid principal balance	442	723	442	723
Unpaid Principal Balance [Member] | Multifamily Residential [Member]
Impaired loans with a valuation allowance unpaid principal balance		2,958		2,958
Impaired loans without a valuation allowance unpaid principal balance	3,466	5,175	3,466	5,175
Unpaid Principal Balance [Member] | Commercial Real Estate Loans [Member]
Impaired loans with a valuation allowance unpaid principal balance	1,921	4,301	1,921	4,301
Impaired loans without a valuation allowance unpaid principal balance	5,761	8,937	5,761	8,937
Unpaid Principal Balance [Member] | One-to-Four-Family Construction [Member]
Impaired loans without a valuation allowance unpaid principal balance	250		250
Unpaid Principal Balance [Member] | Other Construction and Land [Member]
Impaired loans with a valuation allowance unpaid principal balance	634	925	634	925
Impaired loans without a valuation allowance unpaid principal balance	3,883	2,758	3,883	2,758
Unpaid Principal Balance [Member] | Commercial Loans [Member]
Impaired loans with a valuation allowance unpaid principal balance	380		380
Impaired loans without a valuation allowance unpaid principal balance	22	72	22	72
Unpaid Principal Balance [Member] | Consumer Loans [Member]
Impaired loans with a valuation allowance unpaid principal balance		70		70
Impaired loans without a valuation allowance unpaid principal balance	24	49	24	49
Unpaid Principal Balance [Member]
Impaired loans with a valuation allowance unpaid principal balance	4,609	11,381	4,609	11,381
Impaired loans without a valuation allowance unpaid principal balance	20,762	27,780	20,762	27,780
Total impaired loans	25,371	39,161	25,371	39,161
Recorded Investment [Member] | One-to-Four-Family Residential [Member]
Impaired loans with a valuation allowance recorded investment	1,269	2,714	1,269	2,714
Impaired loans without a valuation allowance recorded investment	6,914	10,066	6,914	10,066
Recorded Investment [Member] | Home Equity and Second Mortgage [Member]
Impaired loans with a valuation allowance recorded investment	20	27	20	27
Impaired loans without a valuation allowance recorded investment	442	723	442	723
Recorded Investment [Member] | Multifamily Residential [Member]
Impaired loans with a valuation allowance recorded investment		2,255		2,255
Impaired loans without a valuation allowance recorded investment	3,466	5,175	3,466	5,175
Recorded Investment [Member] | Commercial Real Estate Loans [Member]
Impaired loans with a valuation allowance recorded investment	1,381	2,422	1,381	2,422
Impaired loans without a valuation allowance recorded investment	5,761	8,937	5,761	8,937
Recorded Investment [Member] | One-to-Four-Family Construction [Member]
Impaired loans without a valuation allowance recorded investment	250		250
Recorded Investment [Member] | Other Construction and Land [Member]
Impaired loans with a valuation allowance recorded investment	468	645	468	645
Impaired loans without a valuation allowance recorded investment	3,883	2,758	3,883	2,758
Recorded Investment [Member] | Commercial Loans [Member]
Impaired loans with a valuation allowance recorded investment	230		230
Impaired loans without a valuation allowance recorded investment	22	72	22	72
Recorded Investment [Member] | Consumer Loans [Member]
Impaired loans with a valuation allowance recorded investment		25		25
Impaired loans without a valuation allowance recorded investment	24	49	24	49
Recorded Investment [Member]
Impaired loans with a valuation allowance recorded investment	3,368	8,088	3,368	8,088
Impaired loans without a valuation allowance recorded investment	20,762	27,780	20,762	27,780
Total impaired loans	24,130	35,868	24,130	35,868
Valuation Allowance [Member] | One-to-Four-Family Residential [Member]
Impaired loans with a valuation allowance valuation allowance	193	305	193	305
Total impaired loans	193	305	193	305
Valuation Allowance [Member] | Home Equity and Second Mortgage [Member]
Impaired loans with a valuation allowance valuation allowance	192	81	192	81
Total impaired loans	192	81	192	81
Valuation Allowance [Member] | Multifamily Residential [Member]
Impaired loans with a valuation allowance valuation allowance		703		703
Total impaired loans		703		703
Valuation Allowance [Member] | Commercial Real Estate Loans [Member]
Impaired loans with a valuation allowance valuation allowance	540	1,879	540	1,879
Total impaired loans	540	1,879	540	1,879
Valuation Allowance [Member] | Other Construction and Land [Member]
Impaired loans with a valuation allowance valuation allowance	166	280	166	280
Total impaired loans	166	280	166	280
Valuation Allowance [Member] | Commercial Loans [Member]
Impaired loans with a valuation allowance valuation allowance	150		150
Total impaired loans	150		150
Valuation Allowance [Member] | Consumer Loans [Member]
Impaired loans with a valuation allowance valuation allowance		45		45
Total impaired loans		45		45
Valuation Allowance [Member]
Impaired loans with a valuation allowance valuation allowance	1,241	3,293	1,241	3,293
Total impaired loans	1,241	3,293	1,241	3,293
Average Recorded Investment [Member] | One-to-Four-Family Residential [Member]
Impaired loans with a valuation allowance average recorded investment	1,376	4,148	2,394	3,989
Impaired loans without a valuation allowance average recorded investment	6,691	16,769	7,369	18,623
Average Recorded Investment [Member] | Home Equity and Second Mortgage [Member]
Impaired loans with a valuation allowance average recorded investment	20	123	22	191
Impaired loans without a valuation allowance average recorded investment	446	747	531	820
Average Recorded Investment [Member] | Multifamily Residential [Member]
Impaired loans with a valuation allowance average recorded investment		4,789	564	4,968
Impaired loans without a valuation allowance average recorded investment	1,873	3,971	3,173	3,920
Average Recorded Investment [Member] | Commercial Real Estate Loans [Member]
Impaired loans with a valuation allowance average recorded investment	2,405	1,972	2,346	2,257
Impaired loans without a valuation allowance average recorded investment	5,570	12,333	6,834	11,154
Average Recorded Investment [Member] | One-to-Four-Family Construction [Member]
Impaired loans with a valuation allowance average recorded investment				2
Impaired loans without a valuation allowance average recorded investment	125		63
Average Recorded Investment [Member] | Other Construction and Land [Member]
Impaired loans with a valuation allowance average recorded investment	1,121	3,597	1,257	3,829
Impaired loans without a valuation allowance average recorded investment	5,202	2,945	3,721	3,257
Average Recorded Investment [Member] | Commercial Loans [Member]
Impaired loans with a valuation allowance average recorded investment	115	106	58	162
Impaired loans without a valuation allowance average recorded investment	212	409	245	402
Average Recorded Investment [Member] | Consumer Loans [Member]
Impaired loans with a valuation allowance average recorded investment		3	6	13
Impaired loans without a valuation allowance average recorded investment	58	89	55	92
Average Recorded Investment [Member]
Impaired loans with a valuation allowance average recorded investment	5,037	14,738	6,647	15,411
Impaired loans without a valuation allowance average recorded investment	20,177	37,263	21,991	38,268
Total impaired loans	25,214	52,001	28,638	53,679
Interest Income Recognized [Member] | One-to-Four-Family Residential [Member]
Impaired loans with a valuation allowance interest income recognized		2		24
Impaired loans without a valuation allowance interest income recognized	18	67	70	270
Interest Income Recognized [Member] | Home Equity and Second Mortgage [Member]
Impaired loans with a valuation allowance interest income recognized		2		7
Impaired loans without a valuation allowance interest income recognized		12	5	32
Interest Income Recognized [Member] | Multifamily Residential [Member]
Impaired loans without a valuation allowance interest income recognized	42	46	49	131
Interest Income Recognized [Member] | Commercial Real Estate Loans [Member]
Impaired loans with a valuation allowance interest income recognized			40	18
Impaired loans without a valuation allowance interest income recognized	18	42	102	190
Interest Income Recognized [Member] | Other Construction and Land [Member]
Impaired loans with a valuation allowance interest income recognized		2	9	23
Impaired loans without a valuation allowance interest income recognized		11	89	53
Interest Income Recognized [Member] | Commercial Loans [Member]
Impaired loans without a valuation allowance interest income recognized		1		8
Interest Income Recognized [Member] | Consumer Loans [Member]
Impaired loans with a valuation allowance interest income recognized				1
Impaired loans without a valuation allowance interest income recognized		2	1	4
Interest Income Recognized [Member] | Interest Income Based on Original Terms [Member]
Interest based on original terms	405	881	1,212	2,626
Total impaired loans	405	881	1,212	2,626
Interest Income Recognized [Member]
Impaired loans with a valuation allowance interest income recognized		6	49	73
Interest based on original terms	78	187	365	761
Interest income recognized on a cash basis on impaired loans		121	203	400
Impaired loans without a valuation allowance interest income recognized	78	181	316	688
Total impaired loans	$ 78	$ 187	$ 365	$ 761