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Note 3 - Cash and Cash Equivalents and Restricted Cash (Tables)
12 Months Ended
Sep. 30, 2022
Notes Tables  
Reconciliation of Cash, Cash Equivalents and Restricted Cash [Table Text Block]
   

September 30,

2022

   

September 30,

2021

 
                 

Cash and cash equivalents

  $ 1,341,127     $ 696,380  

Restricted cash

    9,967       9,989  

Total cash, cash equivalents, and restricted cash shown in the cash flow statement

  $ 1,351,094     $ 706,369