Note 4 - Loans and Allowance for Loan Losses - Nonaccruing Loans (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Nonaccruing loans	$ 18,628,598	$ 10,003,477
Residential Portfolio Segment [Member] | Real Estate Residential, One To Four Family Units [Member]
Nonaccruing loans	3,086,159	2,398,379
Residential Portfolio Segment [Member] | Real Estate Residential, Multi Family Units [Member]
Nonaccruing loans	0	0
Real Estate, Construction [Member]
Nonaccruing loans	6,239,326	3,738,410
Commercial Real Estate Portfolio Segment [Member]
Nonaccruing loans	3,932,241	2,941,143
Commercial Portfolio Segment [Member]
Nonaccruing loans	5,249,782	855,761
Consumer and Other Loans [Member]
Nonaccruing loans	$ 121,090	$ 69,784