Note 8 - Loans and Allowance for Credit Losses - Loans by Risk Category (Details) - USD ($)	Sep. 30, 2016	Dec. 31, 2015
Residential Portfolio Segment [Member] | One- to Four-family Loan [Member] | Pass [Member]
Gross loans	$ 0	$ 0
Residential Portfolio Segment [Member] | One- to Four-family Loan [Member] | Special Mention [Member]
Gross loans	838,707	692,601
Residential Portfolio Segment [Member] | One- to Four-family Loan [Member] | Substandard [Member]
Gross loans	2,219,686	2,887,460
Residential Portfolio Segment [Member] | One- to Four-family Loan [Member] | Doubtful [Member]
Gross loans	0	0
Residential Portfolio Segment [Member] | One- to Four-family Loan [Member] | Not Rated [Member]
Gross loans	99,503,901	95,674,676
Residential Portfolio Segment [Member] | One- to Four-family Loan [Member]
Gross loans	102,562,294	99,254,737
Residential Portfolio Segment [Member] | Multi-family Loans [Member] | Pass [Member]
Gross loans	0	0
Residential Portfolio Segment [Member] | Multi-family Loans [Member] | Special Mention [Member]
Gross loans	127,330	0
Residential Portfolio Segment [Member] | Multi-family Loans [Member] | Substandard [Member]
Gross loans	0	0
Residential Portfolio Segment [Member] | Multi-family Loans [Member] | Doubtful [Member]
Gross loans	0	0
Residential Portfolio Segment [Member] | Multi-family Loans [Member] | Not Rated [Member]
Gross loans	4,132,626	3,969,207
Residential Portfolio Segment [Member] | Multi-family Loans [Member]
Gross loans	4,259,956	3,969,207
Residential Portfolio Segment [Member]
Gross loans	106,822,250	103,223,944
Nonresidential Real Estate Portfolio Segment [Member] | Pass [Member]
Gross loans	20,652,597	18,083,194
Nonresidential Real Estate Portfolio Segment [Member] | Special Mention [Member]
Gross loans	194,989	24,206
Nonresidential Real Estate Portfolio Segment [Member] | Substandard [Member]
Gross loans	1,880,189	2,069,922
Nonresidential Real Estate Portfolio Segment [Member] | Doubtful [Member]
Gross loans	0	0
Nonresidential Real Estate Portfolio Segment [Member] | Not Rated [Member]
Gross loans	0	0
Nonresidential Real Estate Portfolio Segment [Member]
Gross loans	22,727,775	20,177,322
Commercial Portfolio Segment [Member] | Pass [Member]
Gross loans	13,058,919	12,069,815
Commercial Portfolio Segment [Member] | Special Mention [Member]
Gross loans	0	0
Commercial Portfolio Segment [Member] | Substandard [Member]
Gross loans	0	0
Commercial Portfolio Segment [Member] | Doubtful [Member]
Gross loans	0	0
Commercial Portfolio Segment [Member] | Not Rated [Member]
Gross loans	0	0
Commercial Portfolio Segment [Member]
Gross loans	13,058,919	12,069,815
Consumer Portfolio Segment [Member] | Pass [Member]
Gross loans	0	0
Consumer Portfolio Segment [Member] | Special Mention [Member]
Gross loans	0	0
Consumer Portfolio Segment [Member] | Substandard [Member]
Gross loans	0	0
Consumer Portfolio Segment [Member] | Doubtful [Member]
Gross loans	0	0
Consumer Portfolio Segment [Member] | Not Rated [Member]
Gross loans	2,691,540	1,651,371
Consumer Portfolio Segment [Member]
Gross loans	2,691,540	1,651,371
Purchased Auto Loans [Member] | Pass [Member]
Gross loans	0	0
Purchased Auto Loans [Member] | Special Mention [Member]
Gross loans	0	0
Purchased Auto Loans [Member] | Substandard [Member]
Gross loans	12,569	3,069
Purchased Auto Loans [Member] | Doubtful [Member]
Gross loans	0	0
Purchased Auto Loans [Member] | Not Rated [Member]
Gross loans	11,939,041	5,208,686
Purchased Auto Loans [Member]
Gross loans	11,951,610	5,211,755
Pass [Member]
Gross loans	33,711,516	30,153,009
Special Mention [Member]
Gross loans	1,161,026	716,807
Substandard [Member]
Gross loans	4,112,444	4,960,451
Doubtful [Member]
Gross loans	0	0
Not Rated [Member]
Gross loans	118,267,108	106,503,940
Gross loans	$ 157,252,094	$ 142,334,207