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, 2022	Jun. 30, 2021
Investment In Cedar Cellular Investment One [Member] | Notes8.625 Percent [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	$ 13,904	$ 10,493
Accounts receivable, trade, gross	14,413	10,760
Allowance for doubtful accounts receivable, end of period	509	267
Beginning of year	267	253
Reversed to statement of operations	(133)	(182)
Charged to statement of operations	779	232
Utilized	(154)	(59)
Foreign currency adjustment	(250)	23
Current portion of amount outstanding related to sale of remaining interest in Bank Frick (Note 8)	0	7,500
Other receivables	14,994	8,590
Total accounts receivable, net	28,898	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 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	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%