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Note 8 - Other Comprehensive Income (Loss) - Schedule of Other Comprehensive Income and Loss (Details) - USD ($)
3 Months Ended
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