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Accounts and Long-Term Receivable (Details)
 3 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
agreement
Mar. 31, 2021
USD ($)
agreement
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Accounts receivable $ 18,698,000     $ 18,698,000 $ 13,362,000
Long-term receivable $ 7,522,000     $ 7,522,000 3,642,000
Minimum          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Maturity term of accounts and long term receivables       1 year  
Vendor Agreement          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Number of agreements increase in accounts and long term receivable 2 2 2    
Payments to be received from over next four years   $ 5,200,000 $ 9,000,000.0    
Payments to be received from over next two years $ 2,500,000        
Period of payments to be received for accounts and long term receivable 2 years 2 years 4 years    
Net revenue recorded $ 200,000 $ 400,000 $ 500,000    
Financing receivables          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Accounts receivable 6,500,000     $ 6,500,000 2,300,000
Long-term receivable 7,500,000     7,500,000 $ 3,500,000
Long term receivables interest rate         4.50%
Amount of allowance for credit losses or impairments with a contractual maturity of over one year 0     0 $ 0
Accounts and long-term receivable past due 0     0 0
Activity in allowance for credit losses for accounts and long-term receivables       0 0
Construction Contractor, Receivable, Excluding Contract Retainage, Fiscal Year Maturity [Abstract]          
2022 6,927,000     6,927,000  
2023 4,674,000     4,674,000  
2024 1,560,000     1,560,000  
2025 1,560,000     1,560,000  
Total payments 14,721,000     14,721,000  
Less: unearned interest income 753,000     753,000  
Total, net of unearned interest income $ 13,968,000     $ 13,968,000  
Financing receivables | Minimum          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Maturity term of accounts and long term receivables       1 year  
Financing receivables | Other Income          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Accounts And Long Term Receivable, Interest Income       $ 547,000 $ 453,000