Debt Securities - Continuous unrealized loss position (Details) - USD ($)	Dec. 31, 2023	Jun. 30, 2023
Debt Securities, Available-for-sale, Unrealized losses
Less than 12 months	$ (1,839)	$ (109,618)
Over 12 months	(1,077,706)	(931,037)
Total gross unrealized losses	(1,079,545)	(1,040,655)
Debt Securities, Available-for-sale, Fair value
Less than 12 months	204,348	1,287,089
Over 12 months	6,865,819	7,391,645
Fair value	7,070,167	8,678,734
States and municipalities
Debt Securities, Available-for-sale, Unrealized losses
Less than 12 months	(1,831)	(16,739)
Over 12 months	(1,741)
Total gross unrealized losses	(3,572)	(16,739)
Debt Securities, Available-for-sale, Fair value
Less than 12 months	203,169	768,052
Over 12 months	363,122
Fair value	566,291	768,052
Mortgage-backed
Debt Securities, Available-for-sale, Unrealized losses
Less than 12 months	(8)	(2,879)
Over 12 months	(105,565)	(108,338)
Total gross unrealized losses	(105,573)	(111,217)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]
Over 12 months	(99,856)
Total gross unrealized losses	(99,856)
Less than 12 months		(138,043)
Total gross unrealized losses		(138,043)
Debt Securities, Available-for-sale, Fair value
Less than 12 months	1,179	109,037
Over 12 months	1,411,574	1,615,016
Fair value	1,412,753	1,724,053
Debt Securities, Held-to-maturity, Fair value
Over 12 months	409,902
Fair value	409,902
Less than 12 months		378,046
Fair value		378,046
Corporate bonds
Debt Securities, Available-for-sale, Unrealized losses
Less than 12 months		(90,000)
Over 12 months	(970,400)	(822,699)
Total gross unrealized losses	(970,400)	(912,699)
Debt Securities, Available-for-sale, Fair value
Less than 12 months		410,000
Over 12 months	5,091,123	5,776,629
Fair value	$ 5,091,123	$ 6,186,629