Note 4 - Loans and Allowance for Loan Losses - Troubled Debt Restructurings (Details) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Carrying balance of TDR	$ 2,064,736	$ 6,141,262
Residential Portfolio Segment [Member] | Real Estate Residential, One To Four Family Units [Member]
Carrying balance of TDR	177,377	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	839,420	3,700,084
Commercial Real Estate Portfolio Segment [Member]
Carrying balance of TDR	728,810	893,992
Commercial Portfolio Segment [Member]
Carrying balance of TDR	$ 319,129	$ 368,310