Note 3 - Loans Held for Investment, Net - Nonperforming Receivables Past Due (Details) - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due	$ 5,787,495	$ 2,828,957
Financing Receivable, Recorded Investment, Current	264,473,873	242,029,142
Total gross loans	270,261,368	244,858,099
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due		1,797,714
Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due	3,262,671	501,316
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due	2,524,824	529,927
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due	3,576,297	550,000
Financing Receivable, Recorded Investment, Current	216,851,082	195,264,205
Total gross loans	220,427,379	195,814,205
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due	0	550,000
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due	3,026,297	0
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due	550,000	0
One-to-four Family Residential Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due	642,290	678,302
Financing Receivable, Recorded Investment, Current	29,492,977	29,298,323
Total gross loans	30,135,267	29,976,625
One-to-four Family Residential Real Estate Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due	0	108,080
One-to-four Family Residential Real Estate Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due	236,374	501,316
One-to-four Family Residential Real Estate Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due	405,916	68,906
Commercial and Industrial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due	1,568,908	1,600,655
Financing Receivable, Recorded Investment, Current	13,024,563	8,275,365
Total gross loans	14,593,471	9,876,020
Commercial and Industrial Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due	0	1,139,634
Commercial and Industrial Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due	0	0
Commercial and Industrial Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due	1,568,908	461,021
Consumer and Other Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivable, Recorded Investment, Current	5,105,251	9,191,249
Total gross loans	5,105,251	9,191,249
Consumer and Other Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due	0	0
Consumer and Other Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due	0	0
Consumer and Other Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due	$ 0	$ 0