Note 4 - Loans and Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Residential Portfolio Segment [Member] | Construction Loans [Member]
Balance, beginning of period	$ 1,868,000	$ 1,361,000	$ 1,246,000	$ 1,330,000
Provision charged to expense	19,000	(16,000)	640,000	8,000
Losses charged off	(252,000)		(252,000)
Recoveries	33,000	1,000	34,000	8,000
Balance, end of period	1,668,000	1,346,000	1,668,000	1,346,000
Allowance for loan losses:
Ending balance: individually evaluated for impairment	358,000		358,000		$ 540,000
Ending balance: collectively evaluated for impairment	1,310,000		1,310,000		706,000
Loans:
Ending balance: individually evaluated for impairment	7,728,000		7,728,000		8,080,000
Ending balance: collectively evaluated for impairment	45,622,000		45,622,000		37,383,000
Residential Portfolio Segment [Member] | One To Four Family Units [Member]
Balance, beginning of period	826,000	884,000	821,000	900,000
Provision charged to expense	77,000	18,000	74,000	(6,000)
Losses charged off	(47,000)	(99,000)	(47,000)	(99,000)
Recoveries	6,000	2,000	14,000	10,000
Balance, end of period	862,000	805,000	862,000	805,000
Allowance for loan losses:
Ending balance: individually evaluated for impairment	4,000		4,000
Ending balance: collectively evaluated for impairment	858,000		858,000		821,000
Loans:
Ending balance: individually evaluated for impairment	2,162,000		2,162,000		2,272,000
Ending balance: collectively evaluated for impairment	103,452,000		103,452,000		95,985,000
Residential Portfolio Segment [Member] | Multi Family Units [Member]
Balance, beginning of period	159,000	133,000	177,000	127,000
Provision charged to expense	(2,000)	18,000	(20,000)	24,000
Losses charged off
Recoveries
Balance, end of period	157,000	151,000	157,000	151,000
Allowance for loan losses:
Ending balance: individually evaluated for impairment
Ending balance: collectively evaluated for impairment	157,000		157,000		177,000
Loans:
Ending balance: individually evaluated for impairment
Ending balance: collectively evaluated for impairment	36,895,000		36,895,000		41,604,000
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]
Balance, beginning of period	1,486,000	1,986,000	1,526,000	1,992,000
Provision charged to expense	101,000	(41,000)	55,000	(47,000)
Losses charged off
Recoveries	26,000		32,000
Balance, end of period	1,613,000	1,945,000	1,613,000	1,945,000
Allowance for loan losses:
Ending balance: individually evaluated for impairment
Ending balance: collectively evaluated for impairment	1,613,000		1,613,000		1,526,000
Loans:
Ending balance: individually evaluated for impairment	246,000		246,000		1,241,000
Ending balance: collectively evaluated for impairment	222,495,000		222,495,000		207,583,000
Commercial Portfolio Segment [Member]
Balance, beginning of period	1,503,000	1,804,000	1,382,000	1,954,000
Provision charged to expense	21,000	87,000	142,000	(64,000)
Losses charged off	(159,000)		(159,000)
Recoveries	1,000	2,000	1,000	3,000
Balance, end of period	1,366,000	1,893,000	1,366,000	1,893,000
Allowance for loan losses:
Ending balance: individually evaluated for impairment	342,000		342,000		312,000
Ending balance: collectively evaluated for impairment	1,024,000		1,024,000		1,070,000
Loans:
Ending balance: individually evaluated for impairment	1,160,000		1,160,000		2,149,000
Ending balance: collectively evaluated for impairment	81,952,000		81,952,000		78,858,000
Consumer Portfolio Segment [Member] | Other Loans [Member]
Balance, beginning of period	270,000	221,000	223,000	185,000
Provision charged to expense	5,000	22,000	69,000	57,000
Losses charged off	(45,000)	(15,000)	(74,000)	(33,000)
Recoveries	58,000	4,000	70,000	23,000
Balance, end of period	288,000	232,000	288,000	232,000
Allowance for loan losses:
Ending balance: individually evaluated for impairment	17,000		17,000		13,000
Ending balance: collectively evaluated for impairment	271,000		271,000		210,000
Loans:
Ending balance: individually evaluated for impairment	358,000		358,000		988,000
Ending balance: collectively evaluated for impairment	23,390,000		23,390,000		21,004,000
Unallocated Financing Receivables [Member]
Balance, beginning of period	73,000	367,000	437,000	101,000
Provision charged to expense	154,000	(88,000)	(210,000)	178,000
Losses charged off
Recoveries
Balance, end of period	227,000	279,000	227,000	279,000
Allowance for loan losses:
Ending balance: individually evaluated for impairment
Ending balance: collectively evaluated for impairment	227,000		227,000		437,000
Loans:
Ending balance: individually evaluated for impairment
Ending balance: collectively evaluated for impairment
Balance, beginning of period	6,185,000	6,756,000	5,811,940	6,589,000
Provision charged to expense	375,000		750,000	150,000
Losses charged off	(503,000)	(114,000)	(532,000)	(132,000)
Recoveries	124,000	9,000	151,000	44,000
Balance, end of period	6,181,151	$ 6,651,000	6,181,151	$ 6,651,000
Ending balance: individually evaluated for impairment	721,000		721,000		865,000
Ending balance: collectively evaluated for impairment	5,460,000		5,460,000		4,947,000
Ending balance: individually evaluated for impairment	11,654,000		11,654,000		14,730,000
Ending balance: collectively evaluated for impairment	$ 513,806,000		$ 513,806,000		$ 482,417,000