Note 3 - Loans and Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Balance, beginning of year				$ 5,811,940				$ 6,589,000	$ 5,811,940	$ 6,589,000	$ 7,802,000
Provision for Loan Losses	$ 425,000	$ 200,000	$ 375,000	375,000	$ 250,000	$ 200,000		150,000	1,375,000	600,000	1,275,000
Losses charged off									(1,699,000)	(1,451,000)	(2,715,000)
Recoveries									254,000	74,000	227,000
Balance, end of year	5,742,449				5,811,940				5,742,449	5,811,940	6,589,000
Ending balance: individually evaluated for impairment	602,000				865,000				602,000	865,000	785,000
Ending balance: collectively evaluated for impairment	5,140,000				4,947,000				5,140,000	4,947,000	5,804,000
Ending balance: individually evaluated for impairment	8,699,000				14,730,000				8,699,000	14,730,000	6,028,000
Ending balance: collectively evaluated for impairment	535,699,000				482,417,000				535,699,000	482,417,000	487,409,000
Residential Portfolio Segment [Member] | Construction Loans [Member]
Balance, beginning of year				1,246,000				1,330,000	1,246,000	1,330,000	2,387,000
Provision for Loan Losses									1,262,000	1,139,000	(651,000)
Losses charged off									(1,222,000)	(1,233,000)	(411,000)
Recoveries									91,000	10,000	5,000
Balance, end of year	1,377,000				1,246,000				1,377,000	1,246,000	1,330,000
Ending balance: individually evaluated for impairment	302,000				540,000				302,000	540,000	376,000
Ending balance: collectively evaluated for impairment	1,075,000				706,000				1,075,000	706,000	954,000
Ending balance: individually evaluated for impairment	5,447,000				8,080,000				5,447,000	8,080,000	2,893,000
Ending balance: collectively evaluated for impairment	35,465,000				37,383,000				35,465,000	37,383,000	33,892,000
Residential Portfolio Segment [Member] | One To Four Family Units [Member]
Balance, beginning of year				821,000				900,000	821,000	900,000	997,000
Provision for Loan Losses									48,000	0	21,000
Losses charged off									(47,000)	(99,000)	(127,000)
Recoveries									34,000	20,000	9,000
Balance, end of year	856,000				821,000				856,000	821,000	900,000
Ending balance: individually evaluated for impairment	14,000				0				14,000	0	36,000
Ending balance: collectively evaluated for impairment	842,000				821,000				842,000	821,000	864,000
Ending balance: individually evaluated for impairment	2,060,000				2,272,000				2,060,000	2,272,000	847,000
Ending balance: collectively evaluated for impairment	104,351,000				95,985,000				104,351,000	95,985,000	97,054,000
Residential Portfolio Segment [Member] | Multi Family Units [Member]
Balance, beginning of year				177,000				127,000	177,000	127,000	209,000
Provision for Loan Losses									29,000	50,000	(82,000)
Losses charged off									0	0	0
Recoveries									0	0	0
Balance, end of year	206,000				177,000				206,000	177,000	127,000
Ending balance: individually evaluated for impairment	0				0				0	0
Ending balance: collectively evaluated for impairment	206,000				177,000				206,000	177,000	127,000
Ending balance: individually evaluated for impairment	0				0				0	0
Ending balance: collectively evaluated for impairment	48,483,000				41,604,000				48,483,000	41,604,000	33,786,000
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]
Balance, beginning of year				1,526,000				1,992,000	1,526,000	1,992,000	2,059,000
Provision for Loan Losses									198,000	(466,000)	(157,000)
Losses charged off									(69,000)	0	(9,000)
Recoveries									32,000	0	99,000
Balance, end of year	1,687,000				1,526,000				1,687,000	1,526,000	1,992,000
Ending balance: individually evaluated for impairment	0				0				0	0	158,000
Ending balance: collectively evaluated for impairment	1,687,000				1,526,000				1,687,000	1,526,000	1,834,000
Ending balance: individually evaluated for impairment	161,000				1,241,000				161,000	1,241,000	460,000
Ending balance: collectively evaluated for impairment	249,420,000				207,583,000				249,420,000	207,583,000	215,145,000
Commercial Portfolio Segment [Member]
Balance, beginning of year				1,382,000				1,954,000	1,382,000	1,954,000	1,519,000
Provision for Loan Losses									(51,000)	(576,000)	2,388,000
Losses charged off									(171,000)	0	(2,018,000)
Recoveries									8,000	4,000	65,000
Balance, end of year	1,168,000				1,382,000				1,168,000	1,382,000	1,954,000
Ending balance: individually evaluated for impairment	241,000				312,000				241,000	312,000	203,000
Ending balance: collectively evaluated for impairment	927,000				1,070,000				927,000	1,070,000	1,751,000
Ending balance: individually evaluated for impairment	925,000				2,149,000				925,000	2,149,000	1,027,000
Ending balance: collectively evaluated for impairment	74,480,000				78,858,000				74,480,000	78,858,000	91,087,000
Consumer Portfolio Segment [Member] | Other Loans [Member]
Balance, beginning of year				223,000				185,000	223,000	185,000	272,000
Provision for Loan Losses									215,000	117,000	14,000
Losses charged off									(190,000)	(119,000)	(150,000)
Recoveries									89,000	40,000	49,000
Balance, end of year	337,000				223,000				337,000	223,000	185,000
Ending balance: individually evaluated for impairment	45,000				13,000				45,000	13,000	12,000
Ending balance: collectively evaluated for impairment	292,000				210,000				292,000	210,000	173,000
Ending balance: individually evaluated for impairment	106,000				988,000				106,000	988,000	801,000
Ending balance: collectively evaluated for impairment	23,500,000				21,004,000				23,500,000	21,004,000	16,445,000
Unallocated [Member]
Balance, beginning of year				$ 437,000				$ 101,000	437,000	101,000	359,000
Provision for Loan Losses									(326,000)	336,000	(258,000)
Losses charged off									0	0	0
Recoveries									0	0	0
Balance, end of year	111,000				437,000				111,000	437,000	101,000
Ending balance: individually evaluated for impairment	0				0				0	0	0
Ending balance: collectively evaluated for impairment	111,000				437,000				111,000	437,000	101,000
Ending balance: individually evaluated for impairment	0				0				0	0	0
Ending balance: collectively evaluated for impairment	$ 0				$ 0				$ 0	$ 0	$ 0