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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
 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
8.625% Notes [Member] | Investment In Cedar Cellular Investment One [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest rate 8.625%  
Accounts Receivable [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, trade, net $ 16,433 $ 13,262
Accounts receivable, trade, gross 18,186 14,503
Allowance for credit losses, end of period 1,753 1,241
Beginning of period 1,241 509
Reversed to statement of operations (521) (511)
Charged to statement of operations 1,856 1,305
Write-offs (847) (67)
Foreign currency adjustment 24 5
Other receivables 26,092 23,405
Total accounts receivable, net 42,525 36,667
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%