Note 4 - Loans and Allowance for Loan Losses (Details Textual) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	$ 2,456,000		$ 2,542,000
Commercial Loan Referral Income	0	$ 555,490
Substandard [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net			2,500,000
Troubled Debt Restructuring [Member]
Financing Receivable, Allowance for Credit Loss, Ending Balance	$ 168,881		$ 142,393