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Note 5 - Other Investments - Investment in Unconsolidated Entity (Details) - USD ($)
 3 Months Ended 9 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Jun. 30, 2025
Jun. 30, 2024
Sep. 30, 2024
Sep. 30, 2023
Revenue $ 17,264,615     $ 14,458,202     $ 81,016,198 $ 71,536,930    
Other income, net 244,000     (69,349)     1,180,969 140,924    
Net income 538,412 $ 7,676,208 $ 5,269,689 156,692 $ 6,443,390 $ 5,019,992 13,484,309 11,620,074    
Current assets 21,595,712           21,595,712   $ 25,072,301  
Property, plant and equipment, net 260,884,745           260,884,745   253,401,632  
Total assets 324,757,993           324,757,993   320,699,223  
Current liabilities 20,695,773           20,695,773   28,698,430  
Capital 116,261,318 $ 117,833,223 $ 111,761,089 108,767,792 $ 110,543,862 $ 103,544,603 116,261,318 108,767,792 108,136,775 $ 100,732,625
Total liabilities and equity 324,757,993           324,757,993   320,699,223  
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]                    
Revenue 139,410,586     3,723,469     424,079,412 3,723,469    
Operating expenses (75,210,039)     (10,822,325)     (221,547,701) (10,822,325)    
AFUDC 45,553     38,815,497     111,088 343,916,298    
Other income, net 1,612,418     1,899,904     4,989,603 7,799,966    
Net income 65,858,518     $ 33,616,545     207,632,402 $ 344,617,408    
Current assets 229,791,783           229,791,783   263,966,727  
Construction work in progress 0           0   1,568,267  
Property, plant and equipment, net 9,448,500,810           9,448,500,810   9,522,815,742  
Other assets 8,963,640           8,963,640   13,732,299  
Total assets 9,687,256,233           9,687,256,233   9,802,083,035  
Current liabilities 69,667,426           69,667,426   168,645,751  
Noncurrent liabilities 1,120,286           1,120,286   68,965  
Capital 9,616,468,521           9,616,468,521   9,633,368,319  
Total liabilities and equity $ 9,687,256,233           $ 9,687,256,233   $ 9,802,083,035