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Accounts Receivable, Net And Other Receivables And Finance Loans Receivable, Net (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended
Apr. 30, 2022
Sep. 30, 2022
Sep. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Proceeds from disposal of equity-accounted investments (Note 5)   $ 253,000 $ 0    
Accounts receivable, trade, gross   12,604,000   $ 14,413,000  
Other receivables   $ 17,024,000   14,994,000  
Investment In Cedar Cellular Investment One [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Equity ownership percentage   7.625%      
Investment In Cedar Cellular Investment One [Member] | Notes8.625 Percent [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Debt instrument stated interest rate   8.625%      
Carbon Loan [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Proceeds from disposal of equity-accounted investments (Note 5) $ 750,000        
Accounts receivable, trade, gross   $ 3,000,000.0      
Carrying value of investment in a note   250,000      
Loan receivable allowance   250,000     $ 3,000,000.0
Notes Receivable One [Member] | Investment In Cedar Cellular Investment One [Member] | Cedar Cellular Investment1 Ltd [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Carrying value of investment in a note   0   $ 0  
Transactions-Switching Funds [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Other receivables   $ 3,200,000