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Other Comprehensive Income (Schedule of Other Comprehensive Income and Loss) (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2020 | Mar. 31, 2019
Before-Tax Amount |  |  |  |  |  |
Other comprehensive income (loss) | $ (1,615,654) |  | $ (61,990) |  | $ (1,238,811) | $ (174,184)
Tax (Expense) or Benefit |  |  |  |  |  |
Other comprehensive loss | 415,871 |  | 15,956 |  | 318,872 | 44,834
Net-of-Tax Amount |  |  |  |  |  |
Other comprehensive income (loss), net of tax | (1,199,783) | $ 279,844 | (46,034) | $ (83,316) | (919,939) | (129,350)
Interest rate swap [Member] |  |  |  |  |  |
Before-Tax Amount |  |  |  |  |  |
Other comprehensive income (loss) before reclassifications | (1,654,962) |  |  |  | (1,304,269) |
Reclassifications from accumulated other comprehensive income | 16,698 |  |  |  | 20,238 |
Other comprehensive income (loss) | (1,638,264) |  |  |  | (1,284,031) |
Tax (Expense) or Benefit |  |  |  |  |  |
Other comprehensive income before reclassifications | 425,987 |  |  |  | 335,718 |
Reclassifications from accumulated other comprehensive income | (4,297) |  |  |  | (5,208) |
Other comprehensive loss | 421,690 |  |  |  | 330,510 |
Net-of-Tax Amount |  |  |  |  |  |
Other comprehensive income (loss) before reclassifications | (1,228,975) |  |  |  | (968,551) |
Reclassifications from accumulated other comprehensive income | 12,401 |  |  |  | 15,030 |
Other comprehensive income (loss), net of tax | (1,216,574) |  |  |  | (953,521) |
Interest rate swap [Member] |  |  |  |  |  |
Before-Tax Amount |  |  |  |  |  |
Other comprehensive income (loss) before reclassifications |  |  | (40,059) |  |  | (134,015)
Reclassifications from accumulated other comprehensive income |  |  | (19,355) |  |  | (35,017)
Other comprehensive income (loss) |  |  | (59,414) |  |  | (169,032)
Tax (Expense) or Benefit |  |  |  |  |  |
Other comprehensive income before reclassifications |  |  | 10,311 |  |  | 34,495
Reclassifications from accumulated other comprehensive income |  |  | 4,982 |  |  | 9,013
Other comprehensive loss |  |  | 15,293 |  |  | 43,508
Net-of-Tax Amount |  |  |  |  |  |
Other comprehensive income (loss) before reclassifications |  |  | (29,748) |  |  | (99,520)
Reclassifications from accumulated other comprehensive income |  |  | (14,373) |  |  | (26,004)
Other comprehensive income (loss), net of tax |  |  | (44,121) |  |  | (125,524)
Defined benefit plans [Member] |  |  |  |  |  |
Before-Tax Amount |  |  |  |  |  |
Other comprehensive income (loss) | 22,610 |  | (2,576) |  | 45,220 | (5,152)
Tax (Expense) or Benefit |  |  |  |  |  |
Other comprehensive loss | (5,819) |  | 663 |  | (11,638) | 1,326
Net-of-Tax Amount |  |  |  |  |  |
Other comprehensive income (loss), net of tax | $ 16,791 |  | $ (1,913) |  | $ 33,582 | $ (3,826)

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