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Accounts Receivable, Net And Other Receivables And Finance Loans Receivable, Net (Schedule Of Accounts Receivable, Net And Other Receivables) (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Dec. 31, 2023
Jun. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, trade, net $ 13,169 $ 11,037
Accounts receivable, trade, gross 13,591 11,546
Allowance for doubtful accounts receivable, end of period 422 509
Beginning of period 509 509
Other receivables 27,945 14,628
Total accounts receivable, net $ 41,114 $ 25,665
Notes 8.625 Percent [Member] | Investment In Cedar Cellular Investment One [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest rate 8.625% 8.625%
Accounts Receivable [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Reallocation to allowance for doubtful finance loans receivable $ 0 $ (418)
Reversed to statement of operations (227) (31)
Charged to statement of operations 586 2,005
Utilized (458) (1,645)
Foreign currency adjustment 12 89
Other receivables 27,945 14,628
Total accounts receivable, net 41,114 25,665
Accounts Receivable [Member] | Held To Maturity Investments [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total accounts receivable, net 0 0
Accounts Receivable [Member] | Investment In Cedar Cellular Investment One [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, trade, gross 0 0
Carbon [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Allowance for doubtful loans receivable 750 750
Carbon [Member] | Accounts Receivable [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total accounts receivable, net $ 0 $ 0
Cedar Cellular Investment1 Ltd [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Equity ownership percentage 7.625% 7.625%