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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, 2023
Jun. 30, 2022
Notes8.625 Percent [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 $ 11,037 $ 13,904
Accounts receivable, trade, gross 11,546 14,413
Allowance for doubtful accounts receivable, end of period 509 509
Beginning of period 509 267
Reallocation to allowance for doubtful finance loans receivable (418) 0
Reversed to statement of operations (31) (133)
Charged to statement of operations 2,006 779
Utilized (1,646) (154)
Foreign currency adjustment 89 (250)
Other receivables 14,628 14,994
Total accounts receivable, net 25,665 28,898
Accounts Receivable [Member] | Held To Maturity Investments [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, trade, gross 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]    
Loan receivable allowance   3,000
Carbon [Member] | Accounts Receivable [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan provided $ 0 $ 0
Cedar Cellular Investment1 Ltd [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Equity ownership percentage 7.625% 7.625%
Cedar Cellular Investment1 Ltd [Member] | Notes8.625 Percent [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest rate 8.625% 8.625%