Note 4 - Loans and Allowance for Loan Losses (Detail) - Recorded Investment in Loans (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Dec. 31, 2011
Allowance for loan losses:
Balance	$ 8,112,081		$ 8,740,325
Allowance for loan losses:
Ending balance: individually evaluated for impairment	666,000		1,367,000
Ending balance: collectively evaluated for impairment	7,446,000		7,373,000
Loans:
Loans Ending balance: individually evaluated for impairment	17,546,000		17,277,000
Loans Ending balance: collectively evaluated for impairment	442,578,000		457,132,000
Construction [Member] | Beginning of Period [Member]
Allowance for loan losses:
Balance			2,525,000	2,508,000
Provision charged to expense	156,000	721,000
Losses charged off	(438,000)
Recoveries	10,000	10,000
Construction [Member] | End of Period [Member]
Allowance for loan losses:
Balance	2,253,000	3,239,000
Construction [Member]
Allowance for loan losses:
Ending balance: individually evaluated for impairment	170,000		608,000
Ending balance: collectively evaluated for impairment	2,083,000		2,087,000
Loans:
Loans Ending balance: individually evaluated for impairment	5,936,000		6,275,000
Loans Ending balance: collectively evaluated for impairment	45,928,000		42,642,000
Real Estate Commercial [Member] | Beginning of Period [Member]
Allowance for loan losses:
Balance			2,517,000	2,725,000
Provision charged to expense	(420,000)	359,000
Losses charged off	(186,000)	(478,000)
Recoveries		14,000
Real Estate Commercial [Member] | End of Period [Member]
Allowance for loan losses:
Balance	1,911,000	2,620,000
Real Estate Commercial [Member]
Allowance for loan losses:
Ending balance: individually evaluated for impairment			180,000
Ending balance: collectively evaluated for impairment	1,911,000		2,167,000
Loans:
Loans Ending balance: individually evaluated for impairment	5,079,000		5,673,000
Loans Ending balance: collectively evaluated for impairment	149,654,000		162,088,000
One to Four Family Units [Member] | Beginning of Period [Member]
Allowance for loan losses:
Balance			1,316,000	1,735,000
Provision charged to expense	(26,000)	(24,000)
Losses charged off	(60,000)	(108,000)
Recoveries	4,000	3,000
One to Four Family Units [Member] | End of Period [Member]
Allowance for loan losses:
Balance	1,234,000	1,606,000
One to Four Family Units [Member]
Allowance for loan losses:
Ending balance: individually evaluated for impairment	21,000		90,000
Ending balance: collectively evaluated for impairment	1,213,000		1,226,000
Loans:
Loans Ending balance: individually evaluated for impairment	2,196,000		2,360,000
Loans Ending balance: collectively evaluated for impairment	95,558,000		97,022,000
Multi-Family Units [Member] | Beginning of Period [Member]
Allowance for loan losses:
Balance			284,000	390,000
Provision charged to expense	1,000	(1,000)
Multi-Family Units [Member] | End of Period [Member]
Allowance for loan losses:
Balance	285,000	389,000
Multi-Family Units [Member]
Allowance for loan losses:
Ending balance: collectively evaluated for impairment	285,000		284,000
Loans:
Loans Ending balance: collectively evaluated for impairment	46,505,000		46,405,000
Commercial Loans [Member] | Beginning of Period [Member]
Allowance for loan losses:
Balance			1,689,000	1,948,000
Provision charged to expense	109,000	(163,000)
Losses charged off	(373,000)
Recoveries	35,000	31,000
Commercial Loans [Member] | End of Period [Member]
Allowance for loan losses:
Balance	1,460,000	1,816,000
Commercial Loans [Member]
Allowance for loan losses:
Ending balance: individually evaluated for impairment	423,000		441,000
Ending balance: collectively evaluated for impairment	1,037,000		1,248,000
Loans:
Loans Ending balance: individually evaluated for impairment	3,969,000		2,555,000
Loans Ending balance: collectively evaluated for impairment	87,302,000		92,672,000
Consumer and Other Loans [Member] | Beginning of Period [Member]
Allowance for loan losses:
Balance			255,000	372,000
Provision charged to expense	40,000	26,000
Losses charged off	(33,000)	(19,000)
Recoveries	13,000	8,000
Consumer and Other Loans [Member] | End of Period [Member]
Allowance for loan losses:
Balance	275,000	387,000
Consumer and Other Loans [Member]
Allowance for loan losses:
Ending balance: individually evaluated for impairment	52,000		48,000
Ending balance: collectively evaluated for impairment	223,000		207,000
Loans:
Loans Ending balance: individually evaluated for impairment	366,000		414,000
Loans Ending balance: collectively evaluated for impairment	17,631,000		16,303,000
Unallocated [Member] | Beginning of Period [Member]
Allowance for loan losses:
Balance			154,000	935,000
Provision charged to expense	540,000	(18,000)
Unallocated [Member] | End of Period [Member]
Allowance for loan losses:
Balance	694,000	917,000
Unallocated [Member]
Allowance for loan losses:
Ending balance: collectively evaluated for impairment	694,000		154,000
Beginning of Period [Member]
Allowance for loan losses:
Balance			8,740,000	10,613,000
Provision charged to expense	400,000	900,000
Losses charged off	(1,090,000)	(605,000)
Recoveries	62,000	66,000
End of Period [Member]
Allowance for loan losses:
Balance	$ 8,112,000	$ 10,974,000