Note 4 - Loans Held for Investment, Net - Credit Quality Indicators (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Total	$ 313,679,541	$ 295,468,588
Pass [Member]
Total	306,624,600	288,151,676
Special Mention [Member]
Total	863,366	883,255
Substandard [Member]
Total	6,191,575	6,433,657
Doubtful [Member]
Total
Loss [Member]
Total	0	0
Commercial Real Estate Portfolio Segment [Member]
Total	248,763,039	242,682,721
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]
Total	243,791,555	237,546,684
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]
Total	504,150	508,201
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Total	4,467,334	4,627,836
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member]
Total
Commercial Real Estate Portfolio Segment [Member] | Loss [Member]
Total	0	0
One-to-four Family Residential Real Estate Portfolio Segment [Member]
Total	27,693,590	28,849,640
One-to-four Family Residential Real Estate Portfolio Segment [Member] | Pass [Member]
Total	25,855,307	26,969,204
One-to-four Family Residential Real Estate Portfolio Segment [Member] | Special Mention [Member]
Total	359,216	375,054
One-to-four Family Residential Real Estate Portfolio Segment [Member] | Substandard [Member]
Total	1,479,067	1,505,382
One-to-four Family Residential Real Estate Portfolio Segment [Member] | Doubtful [Member]
Total	0	0
One-to-four Family Residential Real Estate Portfolio Segment [Member] | Loss [Member]
Total	0	0
Commercial and Industrial Portfolio Segment [Member]
Total	34,081,604	20,075,236
Commercial and Industrial Portfolio Segment [Member] | Pass [Member]
Total	33,836,430	19,774,797
Commercial and Industrial Portfolio Segment [Member] | Special Mention [Member]
Total
Commercial and Industrial Portfolio Segment [Member] | Substandard [Member]
Total	245,174	300,439
Commercial and Industrial Portfolio Segment [Member] | Doubtful [Member]
Total	0	0
Commercial and Industrial Portfolio Segment [Member] | Loss [Member]
Total	0	0
Consumer and Other Portfolio Segment [Member]
Total	3,141,308	3,860,991
Consumer and Other Portfolio Segment [Member] | Pass [Member]
Total	3,141,308	3,860,991
Consumer and Other Portfolio Segment [Member] | Special Mention [Member]
Total		0
Consumer and Other Portfolio Segment [Member] | Substandard [Member]
Total
Consumer and Other Portfolio Segment [Member] | Doubtful [Member]
Total	0	0
Consumer and Other Portfolio Segment [Member] | Loss [Member]
Total	$ 0	$ 0