Note 4 - Loans and Allowance for Loan Losses - Nonaccruing Loans (Details) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Nonaccruing loans	$ 10,116,435	$ 18,628,598
Residential Portfolio Segment [Member] | Real Estate Residential, One To Four Family Units [Member]
Nonaccruing loans	1,503,495	3,086,159
Residential Portfolio Segment [Member] | Real Estate Residential, Multi Family Units [Member]
Nonaccruing loans	0	0
Real Estate, Construction [Member]
Nonaccruing loans	2,891,243	6,239,326
Commercial Real Estate Portfolio Segment [Member]
Nonaccruing loans	3,538,482	3,932,241
Commercial Portfolio Segment [Member]
Nonaccruing loans	2,079,678	5,249,782
Consumer and Other Loans [Member]
Nonaccruing loans	$ 103,537	$ 121,090