Note 4 - Loans and Allowance for Loan Losses - Troubled Debt Restructurings (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Carrying balance of TDR	$ 6,162,421	$ 6,141,262
Residential Portfolio Segment [Member] | Real Estate Residential, One To Four Family Units [Member]
Carrying balance of TDR	1,178,475	1,178,876
Residential Portfolio Segment [Member] | Real Estate Residential, Multi Family Units [Member]
Carrying balance of TDR	0	0
Real Estate, Construction [Member]
Carrying balance of TDR	3,728,165	3,700,084
Commercial Real Estate Portfolio Segment [Member]
Carrying balance of TDR	892,242	893,992
Commercial Portfolio Segment [Member]
Carrying balance of TDR	$ 363,539	$ 368,310