Note 8 - Loans and Allowance for Credit Losses - Recorded Investment in Loans and the Related Allowances (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Dec. 31, 2015
Residential Portfolio Segment [Member] | One- to Four-family Loan [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Balance at beginning of period			$ 15,828
Balance at end of period	$ 35,368		35,368
Gross loans					$ 479,835	$ 575,605
Allowance for loan losses	35,368		35,368		35,368	15,828
Residential Portfolio Segment [Member] | One- to Four-family Loan [Member]
Balance at beginning of period	1,574,598	$ 1,986,275	1,727,582	$ 1,812,448
Provision for loan losses	(28,679)	(122,360)	9,364	(32,492)
Loans charged off	(2,698)	(158,302)	(233,264)	(168,359)
Recoveries of loans previously charged off	20,500	599	60,039	94,615
Balance at end of period	1,563,721	1,706,212	1,563,721	1,706,212
Loans individually evaluated for impairment					1,739,851	2,311,855
Gross loans					102,562,294	99,254,737
Loans collectively evaluated for impairment					100,342,608	96,367,277
Loans individually evaluated for impairment					211,410	295,770
Allowance for loan losses	1,574,598	1,986,275	1,563,721	1,706,212	1,563,721	1,727,582
Loans collectively evaluated for impairment					1,316,943	1,415,984
Residential Portfolio Segment [Member] | Multi-family Loans [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Balance at beginning of period			0
Balance at end of period	0		0
Gross loans					0	0
Allowance for loan losses	0		0		0	0
Residential Portfolio Segment [Member] | Multi-family Loans [Member]
Balance at beginning of period	167,485	143,970	142,237	121,918
Provision for loan losses	(132,076)	18,729	(114,771)	66,730
Loans charged off	0	0	0	(33,892)
Recoveries of loans previously charged off	3,972	4,472	11,915	12,415
Balance at end of period	39,381	167,171	39,381	167,171
Loans individually evaluated for impairment					0	0
Gross loans					4,259,956	3,969,207
Loans collectively evaluated for impairment					4,259,956	3,969,207
Loans individually evaluated for impairment					0	0
Allowance for loan losses	167,485	143,970	39,381	167,171	39,381	142,237
Loans collectively evaluated for impairment					39,381	142,237
Residential Portfolio Segment [Member]
Gross loans					106,822,250	103,223,944
Nonresidential Real Estate Portfolio Segment [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Balance at beginning of period			0
Balance at end of period	0		0
Gross loans					0	0
Allowance for loan losses	0		0		0	0
Nonresidential Real Estate Portfolio Segment [Member]
Balance at beginning of period	275,347	243,010	198,340	245,098
Provision for loan losses	98,221	67,433	175,228	65,345
Loans charged off	0	(18,307)	0	(18,307)
Recoveries of loans previously charged off	0	0	0	0
Balance at end of period	373,568	292,136	373,568	292,136
Loans individually evaluated for impairment					1,880,189	2,069,922
Gross loans					22,727,775	20,177,322
Loans collectively evaluated for impairment					20,847,586	18,107,400
Loans individually evaluated for impairment					252,352	75,086
Allowance for loan losses	275,347	243,010	373,568	292,136	373,568	198,340
Loans collectively evaluated for impairment					121,216	123,254
Commercial Portfolio Segment [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Balance at beginning of period			0
Balance at end of period	0		0
Gross loans					0	0
Allowance for loan losses	0		0		0	0
Commercial Portfolio Segment [Member]
Balance at beginning of period	53,256	32,650	51,306	35,947
Provision for loan losses	21,914	12,777	23,864	9,480
Loans charged off	0	0	0	0
Recoveries of loans previously charged off	0	0	0	0
Balance at end of period	75,170	45,427	75,170	45,427
Loans individually evaluated for impairment					0	0
Gross loans					13,058,919	12,069,815
Loans collectively evaluated for impairment					13,058,919	12,069,815
Loans individually evaluated for impairment					0	0
Allowance for loan losses	53,256	32,650	75,170	45,427	75,170	51,306
Loans collectively evaluated for impairment					75,170	51,306
Consumer Portfolio Segment [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Balance at beginning of period			0
Balance at end of period	0		0
Gross loans					0	0
Allowance for loan losses	0		0		0	0
Consumer Portfolio Segment [Member]
Balance at beginning of period	60,491	29,199	37,187	10,804
Provision for loan losses	22,610	18,628	42,460	80,694
Loans charged off	0	(13,647)	0	(60,055)
Recoveries of loans previously charged off	1,551	1,741	5,005	4,478
Balance at end of period	84,652	35,921	84,652	35,921
Loans individually evaluated for impairment					0	0
Gross loans					2,691,540	1,651,371
Loans collectively evaluated for impairment					2,691,540	1,651,371
Loans individually evaluated for impairment					0	0
Allowance for loan losses	60,491	29,199	84,652	35,921	84,652	37,187
Loans collectively evaluated for impairment					84,652	37,187
Purchased Auto Loans [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Balance at beginning of period			0
Balance at end of period	0		0
Gross loans					0	0
Allowance for loan losses	0		0		0	0
Purchased Auto Loans [Member]
Balance at beginning of period	156,864	93,112	67,354	88,392
Provision for loan losses	43,010	4,793	166,355	30,243
Loans charged off	(29,718)	(21,772)	(68,011)	(46,062)
Recoveries of loans previously charged off	1,506	1,587	5,964	5,147
Balance at end of period	171,662	77,720	171,662	77,720
Loans individually evaluated for impairment					12,569	3,069
Gross loans					11,951,610	5,211,755
Loans collectively evaluated for impairment					11,939,041	5,208,686
Loans individually evaluated for impairment					6,285	0
Allowance for loan losses	156,864	93,112	171,662	77,720	171,662	67,354
Loans collectively evaluated for impairment					165,377	67,354
Receivables Acquired with Deteriorated Credit Quality [Member]
Balance at beginning of period			15,828
Balance at end of period	35,368		35,368
Gross loans					479,835	575,605
Allowance for loan losses	35,368		35,368		35,368	15,828
Balance at beginning of period	2,288,041	2,528,216	2,224,006	2,314,607
Provision for loan losses	25,000	0	302,500	220,000
Loans charged off	(32,416)	(212,028)	(301,275)	(326,675)
Recoveries of loans previously charged off	27,529	8,399	82,923	116,655
Balance at end of period	2,308,154	2,324,587	2,308,154	2,324,587
Loans individually evaluated for impairment					3,632,609	4,384,846
Gross loans					157,252,094	142,334,207
Loans collectively evaluated for impairment					153,139,650	137,373,756
Loans individually evaluated for impairment					470,047	370,856
Allowance for loan losses	$ 2,308,154	$ 2,528,216	$ 2,308,154	$ 2,324,587	2,308,154	2,224,006
Loans collectively evaluated for impairment					$ 1,802,739	$ 1,837,322