Note 3 - Loans and Allowance for Loan Losses (Details) - Allowance for Loan Losses - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for loan losses:
Balance, beginning of period				$ 6,588,597				$ 7,802,000	$ 6,588,597	$ 7,802,000	$ 8,740,000
Balance, end of period	$ 5,811,940				$ 6,588,597				5,811,940	6,588,597	7,802,000
Ending balance: individually evaluated for impairment	865,000				785,000				865,000	785,000	1,601,000
Ending balance: collectively evaluated for impairment	4,947,000				5,804,000				4,947,000	5,804,000	6,201,000
Provision charged to expense	250,000	$ 200,000	$ 0	150,000	300,000	$ 450,000	$ 325,000	200,000	600,000	1,275,000	1,550,000
Losses charged off									(1,451,000)	(2,715,000)	(2,727,000)
Recoveries									74,000	227,000	239,000
Loans:
Loans ending balance: individually evaluated for impairment	14,730,000				6,028,000				14,730,000	6,028,000	16,171,000
Loans ending balance: collectively evaluated for impairment	482,417,000				487,409,000				482,417,000	487,409,000	456,186,000
Residential Portfolio Segment [Member] | Construction Loans [Member]
Allowance for loan losses:
Balance, beginning of period				1,330,000				2,387,000	1,330,000	2,387,000	2,525,000
Balance, end of period	1,246,000				1,330,000				1,246,000	1,330,000	2,387,000
Ending balance: individually evaluated for impairment	540,000				376,000				540,000	376,000	890,000
Ending balance: collectively evaluated for impairment	706,000				954,000				706,000	954,000	1,497,000
Provision charged to expense									1,139,000	(651,000)	691,000
Losses charged off									(1,233,000)	(411,000)	(879,000)
Recoveries									10,000	5,000	50,000
Loans:
Loans ending balance: individually evaluated for impairment	8,080,000				2,893,000				8,080,000	2,893,000	4,530,000
Loans ending balance: collectively evaluated for impairment	37,383,000				33,892,000				37,383,000	33,892,000	38,736,000
Residential Portfolio Segment [Member] | One-to-four Family Units [Member]
Allowance for loan losses:
Balance, beginning of period				900,000				997,000	900,000	997,000	1,316,000
Balance, end of period	821,000				900,000				821,000	900,000	997,000
Ending balance: individually evaluated for impairment	0				36,000				0	36,000	8,000
Ending balance: collectively evaluated for impairment	821,000				864,000				821,000	864,000	989,000
Provision charged to expense									0	21,000	(203,000)
Losses charged off									(99,000)	(127,000)	(139,000)
Recoveries									20,000	9,000	23,000
Loans:
Loans ending balance: individually evaluated for impairment	2,272,000				847,000				2,272,000	847,000	886,000
Loans ending balance: collectively evaluated for impairment	95,985,000				97,054,000				95,985,000	97,054,000	92,912,000
Residential Portfolio Segment [Member] | Multi-family Units [Member]
Allowance for loan losses:
Balance, beginning of period				127,000				209,000	127,000	209,000	284,000
Balance, end of period	177,000				127,000				177,000	127,000	209,000
Ending balance: individually evaluated for impairment	0				0				0	0	0
Ending balance: collectively evaluated for impairment	177,000				127,000				177,000	127,000	209,000
Provision charged to expense									50,000	(82,000)	(75,000)
Losses charged off									0	0	0
Recoveries									0	0	0
Loans:
Loans ending balance: individually evaluated for impairment	0				0				0	0	0
Loans ending balance: collectively evaluated for impairment	41,604,000				33,786,000				41,604,000	33,786,000	46,188,000
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]
Allowance for loan losses:
Balance, beginning of period				1,992,000				2,059,000	1,992,000	2,059,000	2,517,000
Balance, end of period	1,526,000				1,992,000				1,526,000	1,992,000	2,059,000
Ending balance: individually evaluated for impairment	0				158,000				0	158,000	0
Ending balance: collectively evaluated for impairment	1,526,000				1,834,000				1,526,000	1,834,000	2,059,000
Provision charged to expense									(466,000)	(157,000)	(181,000)
Losses charged off									0	(9,000)	(277,000)
Recoveries									0	99,000	0
Loans:
Loans ending balance: individually evaluated for impairment	1,241,000				460,000				1,241,000	460,000	3,663,000
Loans ending balance: collectively evaluated for impairment	207,583,000				215,145,000				207,583,000	215,145,000	175,417,000
Commercial Portfolio Segment [Member]
Allowance for loan losses:
Balance, beginning of period				1,954,000				1,519,000	1,954,000	1,519,000	1,689,000
Balance, end of period	1,382,000				1,954,000				1,382,000	1,954,000	1,519,000
Ending balance: individually evaluated for impairment	312,000				203,000				312,000	203,000	601,000
Ending balance: collectively evaluated for impairment	1,070,000				1,751,000				1,070,000	1,751,000	918,000
Provision charged to expense									(576,000)	2,388,000	988,000
Losses charged off									0	(2,018,000)	(1,268,000)
Recoveries									4,000	65,000	110,000
Loans:
Loans ending balance: individually evaluated for impairment	2,149,000				1,027,000				2,149,000	1,027,000	6,776,000
Loans ending balance: collectively evaluated for impairment	78,858,000				91,087,000				78,858,000	91,087,000	85,946,000
Consumer Portfolio Segment [Member] | Other Loans [Member]
Allowance for loan losses:
Balance, beginning of period				185,000				272,000	185,000	272,000	255,000
Balance, end of period	223,000				185,000				223,000	185,000	272,000
Ending balance: individually evaluated for impairment	13,000				12,000				13,000	12,000	102,000
Ending balance: collectively evaluated for impairment	210,000				173,000				210,000	173,000	170,000
Provision charged to expense									117,000	14,000	125,000
Losses charged off									(119,000)	(150,000)	(164,000)
Recoveries									40,000	49,000	56,000
Loans:
Loans ending balance: individually evaluated for impairment	988,000				801,000				988,000	801,000	316,000
Loans ending balance: collectively evaluated for impairment	21,004,000				16,445,000				21,004,000	16,445,000	16,987,000
Unallocated [Member]
Allowance for loan losses:
Balance, beginning of period				$ 101,000				$ 359,000	101,000	359,000	154,000
Balance, end of period	437,000				101,000				437,000	101,000	359,000
Ending balance: individually evaluated for impairment	0				0				0	0	0
Ending balance: collectively evaluated for impairment	437,000				101,000				437,000	101,000	359,000
Provision charged to expense									336,000	(258,000)	205,000
Losses charged off									0	0	0
Recoveries									0	0	0
Loans:
Loans ending balance: individually evaluated for impairment	$ 0				0				$ 0	0	0
Loans ending balance: collectively evaluated for impairment					$ 0					$ 0	$ 0