Accounts Receivable, Net And Other Receivables And Finance Loans Receivable, Net (Schedule Of Accounts Receivable, Net And Other Receivables) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Sep. 30, 2021	Jun. 30, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, trade, net	$ 8,037	$ 10,493
Accounts receivable, trade, gross	8,402	10,760
Allowance for doubtful accounts receivable, end of period	365	267
Beginning of period	267	253
Reversed to statement of operations	0	(182)
Charged to statement of operations	120	232
Utilized	(3)	(59)
Foreign currency adjustment	(19)	23
Other receivables	8,216	8,590
Total accounts receivable, net and other receivables	27,643	26,583
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 7.625% of Cedar Cellular Investment 1 (RF) (Pty) Ltd 8.625% notes
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, trade, gross	0	0
Bank Frick [Member] \| Accounts Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan provided	11,390	7,500
Carbon [Member] \| Accounts Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan provided	$ 0	$ 0
Cedar Cellular [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Equity ownership percentage	7.625%
Cedar Cellular [Member] \| 8.625% Notes [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Equity ownership percentage	7.625%
Interest rate	8.625%

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