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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Reconciliation of the beginning and ending balance of the assets and liabilities measured at fair value on recurring basis (Details) - USD ($)
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Fair Value Disclosures [Abstract]    
Beginning balance $ 20,323,400 $ 0
Fair value of investment in available-for-sale securities at inception (853,000) 20,000,000
Change in fair value 0 323,400
Ending balance $ 19,470,400 $ 20,323,400