v3.26.1
Note 5 - Other Investments - Investment in Unconsolidated Entity (Details) - USD ($)
 3 Months Ended 9 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Dec. 31, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Jun. 30, 2026
Jun. 30, 2025
Sep. 30, 2025
Sep. 30, 2024
Revenue $ 17,105,393     $ 17,264,615     $ 92,822,870 $ 81,016,198    
Other income, net 328,966     244,000     1,526,376 1,180,969    
Net income 558,900 $ 8,744,490 $ 4,882,865 538,412 $ 7,676,208 $ 5,269,689 14,186,255 13,484,309    
Current assets 22,006,819           22,006,819   $ 23,319,191  
Property, plant and equipment, net 271,436,267           271,436,267   266,712,269  
Total assets 339,659,131           339,659,131   329,839,566  
Current liabilities 23,406,692           23,406,692   22,539,724  
Capital 122,874,179 $ 124,084,505 $ 116,431,475 116,261,318 $ 117,833,223 $ 111,761,089 122,874,179 116,261,318 113,552,790 $ 108,136,775
Total liabilities and equity 339,659,131           339,659,131   329,839,566  
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]                    
Revenue 139,467,118     139,410,586     437,766,773 424,079,412    
Operating expenses (80,999,977)     (75,210,039)     (234,212,807) (221,547,701)    
AFUDC 4,344,515     45,553     10,100,575 111,088    
Other income, net 1,311,601     1,612,418     3,151,190 4,989,603    
Net income 64,123,257     $ 65,858,518     216,805,731 $ 207,632,402    
Current assets 278,541,678           278,541,678   173,283,635  
Construction work in progress 221,058,546           221,058,546   0  
Property, plant and equipment, net 9,309,980,290           9,309,980,290   9,418,928,665  
Other assets 42,990,188           42,990,188   1,789,092  
Total assets 9,852,570,702           9,852,570,702   9,594,001,392  
Current liabilities 68,352,629           68,352,629   40,148,017  
Noncurrent liabilities 2,907,315           2,907,315   1,084,072  
Capital 9,781,310,758           9,781,310,758   9,552,769,303  
Total liabilities and equity $ 9,852,570,702           $ 9,852,570,702   $ 9,594,001,392