Deposits (Details) - USD ($)	Dec. 31, 2023	Jun. 30, 2023
Deposits
Non-interest-bearing demand accounts	$ 24,992,800	$ 26,180,842
Demand, NOW, money market accounts	41,025,708	44,664,015
Savings accounts	39,837,657	42,554,858
Certificates of deposit	73,490,981	83,854,591
Total deposits	179,347,146	197,254,306
Brokered deposits	$ 17,700,000	$ 22,200,000
Non-interest-bearing demand accounts (in percent)	13.94%	13.27%
Demand, NOW, money market accounts (in percent)	22.88%	22.64%
Savings accounts (in percent)	22.21%	21.57%
Certificates of deposit (in percent)	40.98%	42.51%
Total (in percent)	100.00%	100.00%