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Accounts Receivable, Net And Other Receivables And Finance Loans Receivable, Net (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2022
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Jun. 30, 2022
Jun. 30, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Proceeds from disposal of equity-accounted investment (Note 5)   $ 254,000 $ 819,000 $ 645,000 $ 819,000    
Accounts receivable, trade, gross   12,682,000   12,682,000   $ 14,413,000  
Other receivables   $ 21,938,000   $ 21,938,000   14,994,000  
Investment In Cedar Cellular Investment One [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Equity ownership percentage   7.625%   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%   8.625%      
Carbon Loan [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Proceeds from disposal of equity-accounted investment (Note 5) $ 750,000            
Accounts receivable, trade, gross 3,000,000.0 $ 3,000,000.0   $ 3,000,000.0      
Allowance for doubtful loans receivable $ 750,000            
Carrying value of investment in a note   250,000   250,000      
Loan receivable allowance   250,000   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   0  
Transactions-Switching Funds [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Other receivables           $ 3,300,000  
Prepayments [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Other receivables   $ 5,600,000   $ 5,600,000