Note 4 - Loans Held for Investment, Net - Credit Quality Indicators (Details) - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Total	$ 352,719,543	$ 295,468,588
Pass [Member]
Total	345,911,294	288,151,676
Special Mention [Member]
Total	747,539	883,255
Substandard [Member]
Total	6,060,710	6,433,657
Doubtful [Member]
Total
Loss [Member]
Total	0	0
Commercial Real Estate Portfolio Segment [Member]
Total	257,876,733	242,682,721
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]
Total	253,050,106	237,546,684
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]
Total	459,260	508,201
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Total	4,367,367	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	24,354,087	28,849,640
One-to-four Family Residential Real Estate Portfolio Segment [Member] | Pass [Member]
Total	22,606,006	26,969,204
One-to-four Family Residential Real Estate Portfolio Segment [Member] | Special Mention [Member]
Total	288,279	375,054
One-to-four Family Residential Real Estate Portfolio Segment [Member] | Substandard [Member]
Total	1,459,802	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	66,761,757	20,075,236
Commercial and Industrial Portfolio Segment [Member] | Pass [Member]
Total	66,528,216	19,774,797
Commercial and Industrial Portfolio Segment [Member] | Special Mention [Member]
Total
Commercial and Industrial Portfolio Segment [Member] | Substandard [Member]
Total	233,541	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	3,726,966	3,860,991
Consumer and Other Portfolio Segment [Member] | Pass [Member]
Total	3,726,966	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