Note 8 - Loans and Allowance for Credit Losses - Aging of the Recorded Investment in Loans (Details) - USD ($)	Sep. 30, 2016	Dec. 31, 2015
Residential Portfolio Segment [Member] | One- to Four-family Loan [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Loans past due	$ 1,757,833	$ 1,251,155
Residential Portfolio Segment [Member] | One- to Four-family Loan [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Loans past due	149,293	753,597
Residential Portfolio Segment [Member] | One- to Four-family Loan [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans past due	691,864	737,042
Residential Portfolio Segment [Member] | One- to Four-family Loan [Member]
Loans past due	2,598,990	2,741,794
Loans, current	99,963,304	96,512,943
Total loans	102,562,294	99,254,737
Residential Portfolio Segment [Member] | Multi-family Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Loans past due	0	31,274
Residential Portfolio Segment [Member] | Multi-family Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Loans past due	0	0
Residential Portfolio Segment [Member] | Multi-family Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans past due	0	0
Residential Portfolio Segment [Member] | Multi-family Loans [Member]
Loans past due	0	31,274
Loans, current	4,259,956	3,937,933
Total loans	4,259,956	3,969,207
Residential Portfolio Segment [Member]
Total loans	106,822,250	103,223,944
Nonresidential Real Estate Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Loans past due	604,620	847,216
Nonresidential Real Estate Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Loans past due	272,228	112,739
Nonresidential Real Estate Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans past due	0	18,127
Nonresidential Real Estate Portfolio Segment [Member]
Loans past due	876,848	978,082
Loans, current	21,850,927	19,199,240
Total loans	22,727,775	20,177,322
Commercial Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Loans past due	828	9,086
Commercial Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Loans past due	0	0
Commercial Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans past due	0	0
Commercial Portfolio Segment [Member]
Loans past due	828	9,086
Loans, current	13,058,091	12,060,729
Total loans	13,058,919	12,069,815
Consumer Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Loans past due	0	4,814
Consumer Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Loans past due	0	0
Consumer Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans past due	0	0
Consumer Portfolio Segment [Member]
Loans past due	0	4,814
Loans, current	2,691,540	1,646,557
Total loans	2,691,540	1,651,371
Purchased Auto Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Loans past due	17,935	2,391
Purchased Auto Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Loans past due	0	0
Purchased Auto Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans past due	12,569	3,069
Purchased Auto Loans [Member]
Loans past due	30,504	5,460
Loans, current	11,921,106	5,206,295
Total loans	11,951,610	5,211,755
Financing Receivables, 30 to 59 Days Past Due [Member]
Loans past due	2,381,216	2,145,936
Financing Receivables, 60 to 89 Days Past Due [Member]
Loans past due	421,521	866,336
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans past due	704,433	758,238
Loans past due	3,507,170	3,770,510
Loans, current	153,744,924	138,563,697
Total loans	$ 157,252,094	$ 142,334,207