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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