Note 9 - Allowance for Loan Losses and Credit Quality Information - Allowance for Loan Losses (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Dec. 31, 2015
One to Four Family Porfolio Segment [Member]
Balance, March 31, 2016	$ 1,050,000	$ 1,091,000	$ 990,000	$ 1,096,000
Provision for loan losses	220,000	(81,000)	280,000	(87,000)
Charge-offs	0	0	0	0
Recoveries	0	1,000	0	2,000
Balance, June 30, 2016	1,270,000	1,011,000	1,270,000	1,011,000
Specific reserves					$ 308,000	$ 223,000
General reserves					962,000	767,000
Loans and Leases Receivable, Allowance	1,050,000	1,091,000	1,270,000	1,011,000	1,270,000	990,000
Individually reviewed for impairment					1,508,000	2,203,000
Collectively reviewed for impairment					99,212,000	88,742,000
Loans and leases receivable, gross carrying amount					100,720,000	90,945,000
Commercial Real Estate Portfolio Segment [Member]
Balance, March 31, 2016	5,437,000	5,122,000	6,078,000	5,024,000
Provision for loan losses	(37,000)	132,000	(859,000)	197,000
Charge-offs	0	(5,000)	0	(5,000)
Recoveries	427,000	29,000	608,000	62,000
Balance, June 30, 2016	5,827,000	5,278,000	5,827,000	5,278,000
Specific reserves					197,000	296,000
General reserves					5,630,000	5,782,000
Loans and Leases Receivable, Allowance	5,437,000	5,122,000	5,827,000	5,278,000	5,827,000	6,078,000
Individually reviewed for impairment					1,815,000	2,204,000
Collectively reviewed for impairment					289,935,000	245,149,000
Loans and leases receivable, gross carrying amount					291,750,000	247,353,000
Consumer Portfolio Segment [Member]
Balance, March 31, 2016	1,395,000	1,022,000	1,200,000	1,009,000
Provision for loan losses	132,000	143,000	315,000	166,000
Charge-offs	(8,000)	(9,000)	(15,000)	(27,000)
Recoveries	12,000	6,000	31,000	14,000
Balance, June 30, 2016	1,531,000	1,162,000	1,531,000	1,162,000
Specific reserves					378,000	370,000
General reserves					1,153,000	830,000
Loans and Leases Receivable, Allowance	1,395,000	1,022,000	1,531,000	1,162,000	1,531,000	1,200,000
Individually reviewed for impairment					1,134,000	977,000
Collectively reviewed for impairment					73,328,000	63,438,000
Loans and leases receivable, gross carrying amount					74,462,000	64,415,000
Commercial Portfolio Segment [Member]
Balance, March 31, 2016	1,481,000	1,183,000	1,441,000	1,203,000
Provision for loan losses	66,000	(377,000)	(87,000)	(459,000)
Charge-offs	(44,000)	0	(44,000)	0
Recoveries	194,000	145,000	387,000	207,000
Balance, June 30, 2016	1,697,000	951,000	1,697,000	951,000
Specific reserves					67,000	120,000
General reserves					1,630,000	1,321,000
Loans and Leases Receivable, Allowance	1,481,000	1,183,000	1,697,000	951,000	1,697,000	1,441,000
Individually reviewed for impairment					335,000	415,000
Collectively reviewed for impairment					73,198,000	69,691,000
Loans and leases receivable, gross carrying amount					73,533,000	70,106,000
Balance, March 31, 2016	9,363,000	8,418,000	9,709,000	8,332,000
Provision for loan losses	381,000	(183,000)	(351,000)	(183,000)
Charge-offs	(52,000)	(14,000)	(59,000)	(32,000)
Recoveries	633,000	181,000	1,026,000	285,000
Balance, June 30, 2016	10,325,000	8,402,000	10,325,000	8,402,000
Specific reserves					950,000	1,009,000
General reserves					9,375,000	8,700,000
Loans and Leases Receivable, Allowance	$ 10,325,000	$ 8,418,000	$ 10,325,000	$ 8,402,000	10,325,000	9,709,000
Individually reviewed for impairment					4,792,000	5,799,000
Collectively reviewed for impairment					535,673,000	467,020,000
Loans and leases receivable, gross carrying amount					$ 540,465,000	$ 472,819,000