Note 4 - Loans Held for Investment, Net - Nonperforming Receivables Past Due (Details) - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Past due loans	$ 685,128	$ 4,152,071
Current loans	352,034,415	291,316,517
Total	352,719,543	295,468,588
Financial Asset, 30 to 59 Days Past Due [Member]
Past due loans		758,197
Financial Asset, 60 to 89 Days Past Due [Member]
Past due loans	395,110	36,520
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past due loans	290,018	3,357,354
Commercial Real Estate Portfolio Segment [Member]
Past due loans		2,718,731
Current loans	257,876,733	239,963,990
Total	257,876,733	242,682,721
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Past due loans
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Past due loans
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past due loans		2,718,731
One-to-four Family Residential Real Estate Portfolio Segment [Member]
Past due loans	685,128	1,433,340
Current loans	23,668,959	27,416,300
Total	24,354,087	28,849,640
One-to-four Family Residential Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Past due loans		758,197
One-to-four Family Residential Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Past due loans	395,110	36,520
One-to-four Family Residential Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past due loans	290,018	638,623
Commercial and Industrial Portfolio Segment [Member]
Past due loans
Current loans	66,761,757	20,075,236
Total	66,761,757	20,075,236
Commercial and Industrial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Past due loans	0	0
Commercial and Industrial Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Past due loans	0	0
Commercial and Industrial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past due loans
Consumer and Other Portfolio Segment [Member]
Past due loans	0	0
Current loans	3,726,966	3,860,991
Total	3,726,966	3,860,991
Consumer and Other Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Past due loans	0	0
Consumer and Other Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Past due loans	0	0
Consumer and Other Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past due loans	$ 0	$ 0