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Note 8 - Other Comprehensive Income (Loss) - Schedule of Other Comprehensive Income and Loss (Details) - USD ($) | 3 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Other comprehensive income (loss) | $ 472,776 | $ 247,225
Other comprehensive income (loss), tax | (121,693) | (63,636)
Other comprehensive income (loss), net of tax | 351,083 | 183,589
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] |  |
Other comprehensive income (loss) before reclassifications | 315,983 | 89,770
Other comprehensive income (loss) before reclassifications, tax | (81,333) | (23,107)
Other comprehensive income (loss) before reclassifications, net of tax | 234,650 | 66,663
Reclassifications from accumulated other comprehensive income | 171,863 | 137,438
Reclassifications from accumulated other comprehensive income (loss), tax | (44,239) | (35,376)
Reclassifications from accumulated other comprehensive income (loss), net of tax | 127,624 | 102,062
Other comprehensive income (loss) | 487,846 | 227,208
Other comprehensive income (loss), tax | (125,572) | (58,483)
Other comprehensive income (loss), net of tax | 362,274 | 168,725
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] |  |
Other comprehensive income (loss) | (15,070) | 20,017
Other comprehensive income (loss), tax | 3,879 | (5,153)
Other comprehensive income (loss), net of tax | $ (11,191) | $ 14,864

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