Accounts Receivable, Net And Other Receivables And Finance Loans Receivable, Net (Schedule Of Accounts Receivable, Net And Other Receivables) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Mar. 31, 2022	Jun. 30, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, trade, net	$ 10,025	$ 10,493
Accounts receivable, trade, gross	10,479	10,760
Allowance for doubtful accounts receivable, end of period	454	267
Beginning of period	267	253
Reversed to statement of operations	(60)	(182)
Charged to statement of operations	251	232
Utilized	(3)	(59)
Foreign currency adjustment	(1)	23
Other receivables	10,520	8,590
Total accounts receivable, net and other receivables	24,435	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	3,890	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%