Note 9 - Time Deposits - Time Deposit Maturities (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Weighted average rate, one year or less	2.09%	1.51%
One year or less, amount	$ 55,567,378	$ 30,457,540
Weighted average rate, over one through three years	2.08%	2.20%
Over one through three years, amount	$ 22,461,008	$ 43,552,518
Weighted average rate, over three through five years	1.85%	1.58%
Over three through five years, amount	$ 3,359,475	$ 3,528,518
Weighted average rate	2.08%	1.90%
Amount	$ 81,387,861	$ 77,538,576