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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, 2022
Jun. 30, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, trade, net $ 12,073 $ 13,904
Accounts receivable, trade, gross 12,163 14,413
Allowance for doubtful accounts receivable, end of period 90 509
Beginning of period 509 267
Reallocation to allowance for doubtful finance loans receivable (418) 0
Reversed to statement of operations (9) (133)
Charged to statement of operations 507 779
Utilized (412) (154)
Foreign currency adjustment (87) (250)
Other receivables 16,146 14,994
Total accounts receivable, net 28,219 28,898
Accounts Receivable [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current portion of amount outstanding related to sale of interest in Carbon, net of allowance: September 2022: $250 0 0
Accounts Receivable [Member] | Held To Maturity Investments [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 250 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%  
Cedar Cellular Investment1 Ltd [Member] | Notes8.625 Percent [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest rate 8.625%  
Cedar Cellular Investment1 Ltd [Member] | Investment In Cedar Cellular Investment One [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, trade, gross $ 0 $ 0