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Income Taxes (Provision For Income Taxes By Location Of Taxing Jurisdiction) (Details) - USD ($)
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Income Tax [Line Items]        
Current income tax $ 859,000 $ 1,652,000 $ 4,789,000  
Deferred taxation charge (benefit) 6,691,000 932,000 (8,917,000)  
Foreign tax credits generated-United States 10,000 72,000 (944,000)  
Changes in enacted tax rate   0 0 $ 0
Income tax provision 7,560,000 2,656,000 [1] (5,072,000) [1]  
South Africa [Member]        
Income Tax [Line Items]        
Current income tax 866,000 1,552,000 3,689,000  
Deferred taxation charge (benefit) (2,039,000) 653,000 (8,538,000)  
United States [Member]        
Income Tax [Line Items]        
Current income tax (75,000) 12,000 1,100,000  
Deferred taxation charge (benefit) 9,136,000 0 4,000  
Other Income Tax Segment [Member]        
Income Tax [Line Items]        
Current income tax 68,000 88,000 0  
Deferred taxation charge (benefit) $ (406,000) $ 279,000 $ (383,000)  
[1] <div>Certain amounts have been restated to correct the misstatement discussed in Note 1.</div>