Note 4 - Loans Receivable - Allowance for Loan Losses Activity (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] | One-to-Four Family Loans [Member]
Allowance for loan losses, beginning balance	$ 981,000	$ 645,000	$ 911,000	$ 684,000
Charge-offs				(137,000)
Recoveries
Loan loss provision		40,000	70,000	138,000
Allowance for loan losses, ending balance	981,000	685,000	981,000	685,000
Allowance for loan losses, ending balance, allocated to loans individually evaluated for impairment
Allowance for loan losses, ending balance, allocated to loans collectively evaluated for impairment	981,000	685,000	981,000	685,000
Loans receivable	116,207,000	109,005,000	116,207,000	109,005,000	$ 118,133,000
Loans receivable, ending balance, loans individually evaluated for impairment	1,000,000	632,000	1,000,000	632,000
Loans receivable, ending balance, loans collectively evaluated for impairment	115,207,000	108,373,000	115,207,000	108,373,000
Commercial Real Estate Portfolio Segment [Member]
Allowance for loan losses, beginning balance	1,735,000	1,226,000	1,593,000	1,098,000
Charge-offs
Recoveries
Loan loss provision	272,000	199,000	414,000	327,000
Allowance for loan losses, ending balance	2,007,000	1,425,000	2,007,000	1,425,000
Allowance for loan losses, ending balance, allocated to loans individually evaluated for impairment
Allowance for loan losses, ending balance, allocated to loans collectively evaluated for impairment	2,007,000	1,425,000	2,007,000	1,425,000
Loans receivable	200,848,000	136,384,000	200,848,000	136,384,000	167,930,000
Loans receivable, ending balance, loans individually evaluated for impairment	374,000		374,000
Loans receivable, ending balance, loans collectively evaluated for impairment	200,474,000	136,384,000	200,474,000	136,384,000
Real Estate Construction Portfolio Segment [Member]
Allowance for loan losses, beginning balance	244,000	40,000	184,000	35,000
Charge-offs
Recoveries
Loan loss provision		5,000	60,000	10,000
Allowance for loan losses, ending balance	244,000	45,000	244,000	45,000
Allowance for loan losses, ending balance, allocated to loans individually evaluated for impairment
Allowance for loan losses, ending balance, allocated to loans collectively evaluated for impairment	244,000	45,000	244,000	45,000
Loans receivable	16,382,000	13,348,000	16,382,000	13,348,000	22,958,000
Loans receivable, ending balance, loans individually evaluated for impairment		575,000		575,000
Loans receivable, ending balance, loans collectively evaluated for impairment	16,382,000	12,773,000	16,382,000	12,773,000
Home Equity Portfolio Segment [Member]
Allowance for loan losses, beginning balance	365,000	306,000	342,000	270,000
Charge-offs			(7,000)
Recoveries
Loan loss provision		20,000	30,000	56,000
Allowance for loan losses, ending balance	365,000	326,000	365,000	326,000
Allowance for loan losses, ending balance, allocated to loans individually evaluated for impairment
Allowance for loan losses, ending balance, allocated to loans collectively evaluated for impairment	365,000	326,000	365,000	326,000
Loans receivable	47,842,000	41,511,000	47,842,000	41,511,000	45,345,000
Loans receivable, ending balance, loans individually evaluated for impairment	332,000	263,000	332,000	263,000
Loans receivable, ending balance, loans collectively evaluated for impairment	47,510,000	41,248,000	47,510,000	41,248,000
Consumer Portfolio Segment [Member]
Allowance for loan losses, beginning balance	165,000	50,000	66,000	46,000
Charge-offs	(76,000)	(4,000)	(100,000)	(15,000)
Recoveries	9,000	1,000	12,000	2,000
Loan loss provision	76,000	5,000	196,000	19,000
Allowance for loan losses, ending balance	174,000	52,000	174,000	52,000
Allowance for loan losses, ending balance, allocated to loans individually evaluated for impairment	25,000	1,000	25,000	1,000
Allowance for loan losses, ending balance, allocated to loans collectively evaluated for impairment	149,000	51,000	149,000	51,000
Loans receivable	14,618,000	14,480,000	14,618,000	14,480,000	14,641,000
Loans receivable, ending balance, loans individually evaluated for impairment	117,000	42,000	117,000	42,000
Loans receivable, ending balance, loans collectively evaluated for impairment	14,501,000	14,438,000	14,501,000	14,438,000
Commercial Portfolio Segment [Member]
Allowance for loan losses, beginning balance	450,000	358,000	454,000	317,000
Charge-offs	(72,000)		(104,000)
Recoveries
Loan loss provision	111,000	59,000	139,000	100,000
Allowance for loan losses, ending balance	489,000	417,000	489,000	417,000
Allowance for loan losses, ending balance, allocated to loans individually evaluated for impairment		25,000		25,000
Allowance for loan losses, ending balance, allocated to loans collectively evaluated for impairment	489,000	392,000	489,000	392,000
Loans receivable	48,982,000	44,247,000	48,982,000	44,247,000	39,072,000
Loans receivable, ending balance, loans individually evaluated for impairment	261,000	587,000	261,000	587,000
Loans receivable, ending balance, loans collectively evaluated for impairment	48,721,000	43,660,000	48,721,000	43,660,000
Allowance for loan losses, beginning balance	3,940,000	2,625,000	3,550,000	2,450,000
Charge-offs	(148,000)	(4,000)	(211,000)	(152,000)
Recoveries	9,000	1,000	12,000	2,000
Loan loss provision	459,000	328,000	909,000	650,000
Allowance for loan losses, ending balance	4,260,000	2,950,000	4,260,000	2,950,000
Allowance for loan losses, ending balance, allocated to loans individually evaluated for impairment	25,000	26,000	25,000	26,000
Allowance for loan losses, ending balance, allocated to loans collectively evaluated for impairment	4,235,000	2,924,000	4,235,000	2,924,000
Loans receivable	444,879,000	358,975,000	444,879,000	358,975,000	$ 408,079,000
Loans receivable, ending balance, loans individually evaluated for impairment	2,084,000	2,099,000	2,084,000	2,099,000
Loans receivable, ending balance, loans collectively evaluated for impairment	$ 442,795,000	$ 356,876,000	$ 442,795,000	$ 356,876,000