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Note 10 - Other Comprehensive Income (Loss) - Schedule of Other Comprehensive Income and Loss (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2022 | Mar. 31, 2021
Unrealized gains | $ 1,903,875 |  | $ 529,356 |  | $ 2,219,858 | $ 619,126
Unrealized gains | (490,057) |  | (136,257) |  | (571,390) | (159,364)
Unrealized gains | 1,413,818 |  | 393,099 |  | 1,648,468 | 459,762
Transfer of realized losses to interest expense | 163,860 |  | 136,270 |  | 335,723 | 273,708
Transfer of realized losses to interest expense | (42,179) |  | (35,075) |  | (86,418) | (70,451)
Transfer of realized losses to interest expense | 121,681 |  | 101,195 |  | 249,305 | 203,257
Net interest rate swaps | 2,067,735 |  | 665,626 |  | 2,555,581 | 892,834
Net interest rate swaps | (532,236) |  | (171,332) |  | (657,808) | (229,815)
Net interest rate swaps | 1,535,499 |  | 494,294 |  | 1,897,773 | 663,019
Amortization of actuarial gains | (15,070) |  | 20,017 |  | (30,140) | 40,034
Amortization of actuarial gains | 3,879 |  | (5,153) |  | 7,758 | (10,306)
Amortization of actuarial gains | (11,191) |  | 14,864 |  | (22,382) | 29,728
Other comprehensive income | 2,052,665 |  | 685,643 |  | 2,525,441 | 932,868
Other comprehensive income | (528,357) |  | (176,485) |  | (650,050) | (240,121)
Other comprehensive income | $ 1,524,308 | $ 351,083 | $ 509,158 | $ 183,589 | $ 1,875,391 | $ 692,747

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