Note 4 - Loans and Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Residential Portfolio Segment [Member] | Construction Loans [Member]
Balance, beginning of period	$ 1,668,000	$ 1,346,000	$ 1,246,000	$ 1,330,000
Provision charged to expense	282,000	921,000	922,000	929,000
Losses charged off			(252,000)
Recoveries	46,000	1,000	80,000	9,000
Balance, end of period	1,996,000	2,268,000	1,996,000	2,268,000
Allowance for loan losses:
Ending balance: individually evaluated for impairment	971,000		971,000		$ 540,000
Ending balance: collectively evaluated for impairment	1,025,000		1,025,000		706,000
Loans:
Ending balance: individually evaluated for impairment	7,537,000		7,537,000		8,080,000
Ending balance: collectively evaluated for impairment	33,769,000		33,769,000		37,383,000
Residential Portfolio Segment [Member] | One To Four Family Units [Member]
Balance, beginning of period	862,000	805,000	821,000	900,000
Provision charged to expense	6,000	(25,000)	80,000	(32,000)
Losses charged off		(1,000)	(47,000)	(99,000)
Recoveries	17,000	4,000	31,000	14,000
Balance, end of period	885,000	783,000	885,000	783,000
Allowance for loan losses:
Ending balance: individually evaluated for impairment	3,000		3,000
Ending balance: collectively evaluated for impairment	882,000		882,000		821,000
Loans:
Ending balance: individually evaluated for impairment	2,138,000		2,138,000		2,272,000
Ending balance: collectively evaluated for impairment	107,254,000		107,254,000		95,985,000
Residential Portfolio Segment [Member] | Multi Family Units [Member]
Balance, beginning of period	157,000	151,000	177,000	127,000
Provision charged to expense	6,000	10,000	(14,000)	34,000
Losses charged off
Recoveries
Balance, end of period	163,000	161,000	163,000	161,000
Allowance for loan losses:
Ending balance: individually evaluated for impairment
Ending balance: collectively evaluated for impairment	163,000		163,000		177,000
Loans:
Ending balance: individually evaluated for impairment
Ending balance: collectively evaluated for impairment	38,192,000		38,192,000		41,604,000
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]
Balance, beginning of period	1,613,000	1,945,000	1,526,000	1,992,000
Provision charged to expense	86,000	(363,000)	141,000	(410,000)
Losses charged off
Recoveries			32,000
Balance, end of period	1,699,000	1,582,000	1,699,000	1,582,000
Allowance for loan losses:
Ending balance: individually evaluated for impairment	69,000		69,000
Ending balance: collectively evaluated for impairment	1,630,000		1,630,000		1,526,000
Loans:
Ending balance: individually evaluated for impairment	1,077,000		1,077,000		1,241,000
Ending balance: collectively evaluated for impairment	237,645,000		237,645,000		207,583,000
Commercial Portfolio Segment [Member]
Balance, beginning of period	1,366,000	1,893,000	1,382,000	1,954,000
Provision charged to expense	(40,000)	(410,000)	102,000	(474,000)
Losses charged off	(11,000)		(170,000)
Recoveries	8,000	1,000	9,000	4,000
Balance, end of period	1,323,000	1,484,000	1,323,000	1,484,000
Allowance for loan losses:
Ending balance: collectively evaluated for impairment	1,030,000		1,030,000		1,070,000
Loans:
Ending balance: individually evaluated for impairment	943,000		943,000		2,149,000
Ending balance: collectively evaluated for impairment	80,796,000		80,796,000		78,858,000
Consumer Portfolio Segment [Member] | Other Loans [Member]
Balance, beginning of period	288,000	232,000	223,000	185,000
Provision charged to expense	33,000	(4,000)	102,000	54,000
Losses charged off	(58,000)	(46,000)	(132,000)	(80,000)
Recoveries	14,000	11,000	84,000	34,000
Balance, end of period	277,000	193,000	277,000	193,000
Allowance for loan losses:
Ending balance: collectively evaluated for impairment	261,000		261,000		210,000
Loans:
Ending balance: individually evaluated for impairment	150,000		150,000		988,000
Ending balance: collectively evaluated for impairment	23,112,000		23,112,000		21,004,000
Unallocated Financing Receivables [Member]
Balance, beginning of period	227,000	279,000	437,000	101,000
Provision charged to expense	(173,000)	71,000	(383,000)	249,000
Losses charged off
Recoveries
Balance, end of period	54,000	350,000	54,000	350,000
Allowance for loan losses:
Ending balance: collectively evaluated for impairment	54,000		54,000		437,000
Loans:
Ending balance: individually evaluated for impairment
Ending balance: collectively evaluated for impairment
Balance, beginning of period	6,181,000	6,651,000	5,811,940	6,589,000
Provision charged to expense	200,000	200,000	950,000	350,000
Losses charged off	(69,000)	(47,000)	(601,000)	(179,000)
Recoveries	85,000	17,000	236,000	61,000
Balance, end of period	6,396,580	$ 6,822,000	6,396,580	$ 6,822,000
Ending balance: collectively evaluated for impairment	5,045,000		5,045,000		4,947,000
Ending balance: individually evaluated for impairment	11,845,000		11,845,000		14,730,000
Ending balance: collectively evaluated for impairment	$ 520,768,000		$ 520,768,000		$ 482,417,000