Fair Value of Financial Instruments - Fair value on non-recurring basis (Details) - USD ($)	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	$ 251,127,891	$ 259,873,403	$ 262,741,874
Other real estate owned, net	3,606,824	4,080,401
Fair value on non-recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	168,315	274,750
Other real estate owned, net	3,606,824	4,080,401
Total	3,775,139	4,335,151
Fair value on non-recurring basis | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	0	0
Other real estate owned, net	0	0
Total	0	0
Fair value on non-recurring basis | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	0	0
Other real estate owned, net	0	0
Total	0	0
Fair value on non-recurring basis | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	168,315	274,750
Other real estate owned, net	3,606,824	4,080,401
Total	$ 3,775,139	$ 4,355,151