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Debt Securities - Continuous unrealized loss position (Details) - USD ($)
Sep. 30, 2022
Jun. 30, 2022
Debt Securities, Available-for-sale, Unrealized losses    
Less than 12 months $ (565,565) $ (407,241)
Over 12 months (99,197) (82,052)
Total gross unrealized losses (664,762) (489,293)
Debt Securities, Available-for-sale, Fair value    
Less than 12 months 8,645,796 8,901,446
Over 12 months 1,151,585 1,179,360
Fair value 9,797,381 10,080,806
States and municipalities    
Debt Securities, Available-for-sale, Unrealized losses    
Less than 12 months (17,905) (6,144)
Over 12 months (458) (1,379)
Total gross unrealized losses (18,363) (7,523)
Debt Securities, Available-for-sale, Fair value    
Less than 12 months 766,778 688,504
Over 12 months 59,542 58,621
Fair value 826,320 747,125
Mortgage-backed    
Debt Securities, Available-for-sale, Unrealized losses    
Less than 12 months (119,823) (98,106)
Over 12 months (17,031) (15,575)
Total gross unrealized losses (136,854) (113,681)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 months (142,775) (113,363)
Total gross unrealized losses (142,775) (113,363)
Debt Securities, Available-for-sale, Fair value    
Less than 12 months 2,225,270 2,421,426
Over 12 months 96,648 101,977
Fair value 2,321,918 2,523,403
Debt Securities, Held-to-maturity, Fair value    
Less than 12 months 383,742 419,000
Fair value 383,742 419,000
Corporate bonds    
Debt Securities, Available-for-sale, Unrealized losses    
Less than 12 months (427,837) (302,991)
Over 12 months (81,708) (65,098)
Total gross unrealized losses (509,545) (368,089)
Debt Securities, Available-for-sale, Fair value    
Less than 12 months 5,653,748 5,791,516
Over 12 months 995,395 1,018,762
Fair value $ 6,649,143 $ 6,810,278