Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurement - Company's available-for-sale (AFS) securities and other comprehensive income (OCI) (Details)

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Fair Value Measurement - Company's available-for-sale (AFS) securities and other comprehensive income (OCI) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
OCI from AFS securities:        
Unrealized (losses) on AFS securities $ (425,972) $ (137,802) $ (476,016) $ (25,992)
Unrealized (losses) on securities available-for-sale (131,569) (500,188) (81,525) (611,998)
Change in OCI from AFS securities (131,569) (500,188) (81,525) (611,998)
Balance at end of period $ (557,541) $ (637,990) $ (557,541) $ (637,990)