v3.25.4
Accumulated Other Comprehensive Loss (Details) - USD ($)
 3 Months Ended 6 Months Ended
Dec. 31, 2025
Sep. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Dec. 31, 2025
Dec. 31, 2024
Other Comprehensive Loss            
Balance, beginning of period $ 46,280,782 $ 45,709,221 $ 31,587,247 $ 31,294,784 $ 45,709,221 $ 31,294,784
Reclassification adjustment for amortization of stranded tax effect from change in tax legislation [1] (2,019)   (2,767)   (4,321) (5,855)
Balance, end of period 46,885,435 46,280,782 31,684,919 31,587,247 46,885,435 31,684,919
Accumulated Other Comprehensive Loss            
Other Comprehensive Loss            
Balance, beginning of period (432,968) (485,930) (640,995) (752,788) (485,930) (752,788)
Other comprehensive income before reclassifications (net of tax) 29,974 53,865 7,748 113,624    
Amortization of amounts transferred from debt securities available for sale to securities held to maturity (a) 1,263 1,399 1,346 1,257    
Reclassification adjustment for amortization of stranded tax effect from change in tax legislation (2,019) (2,302) (2,767) (3,088)    
Balance, end of period (403,750) (432,968) (634,668) (640,995) (403,750) (634,668)
Unrealized Gains and Losses on Available for Sale Debt Securities            
Other Comprehensive Loss            
Balance, beginning of period (399,746) (451,309) (602,307) (712,843) (451,309) (712,843)
Other comprehensive income before reclassifications (net of tax) 29,974 53,865 7,748 113,624    
Reclassification adjustment for amortization of stranded tax effect from change in tax legislation (2,019) (2,302) (2,767) (3,088)    
Balance, end of period (371,791) (399,746) (597,326) (602,307) (371,791) (597,326)
Unrealized Losses on Held to Maturity Debt Securities            
Other Comprehensive Loss            
Balance, beginning of period (33,222) (34,621) (38,688) (39,945) (34,621) (39,945)
Amortization of amounts transferred from debt securities available for sale to securities held to maturity (a) 1,263 1,399 1,346 1,257    
Balance, end of period $ (31,959) $ (33,222) $ (37,342) $ (38,688) $ (31,959) $ (37,342)
[1] The reclassification is included in the Consolidated Statements of Income as Other Expenses.