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Note 10 - Other Comprehensive Income (Loss) - Reconciliation of Accumulated Comprehensive Income (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
Balance $ 102,294,845 $ 99,701,709 $ 92,549,541 $ 88,887,977 $ 99,701,709 $ 88,887,977
Other comprehensive income 1,524,308 351,083 509,158 183,589 1,875,391 692,747
Balance 105,462,729 102,294,845 97,574,608 92,549,541 105,462,729 97,574,608
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]            
Balance   (888,210)     (888,210)  
Other comprehensive income         1,897,773  
Balance 1,009,563       1,009,563  
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]            
Balance   (647,224)     (647,224)  
Other comprehensive income         (22,382)  
Balance (669,606)       (669,606)  
AOCI Attributable to Parent [Member]            
Balance (1,184,351) (1,535,434) (3,264,355) (3,447,944) (1,535,434) (3,447,944)
Other comprehensive income 1,524,308 351,083 509,158 183,589 1,875,391  
Balance $ 339,957 $ (1,184,351) $ (2,755,197) $ (3,264,355) $ 339,957 $ (2,755,197)