Note 9 - Deposits - Interest Expense on Deposits (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Transaction accounts	$ 1,809,437	$ 2,948,835	$ 6,144,802
Savings accounts	70,036	78,806	119,730
Certificate accounts	2,143,341	3,912,688	4,754,944
Early withdrawal penalties	(12,498)	(15,503)	(28,023)
Interest Expense, Deposits, Total	$ 4,010,316	$ 6,924,826	$ 10,991,453