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Equity-Accounted Investments And Other Long-Term Assets (Narrative) (Details)
R / shares in Units, R in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2022
USD ($)
shares
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2022
USD ($)
shares
Dec. 31, 2021
USD ($)
shares
Jun. 30, 2022
USD ($)
Dec. 31, 2022
ZAR (R)
R / shares
shares
Jun. 30, 2021
USD ($)
Market value of holding $ 5,267,000   $ 5,267,000   $ 5,861,000 [1]    
Cash payment for repurchase of common stock 108,000   293,000        
Allowance for doubtful loans receivable 90,000   90,000   509,000   $ 267,000
Equity Method Investment Realized Gain Loss On Disposal (112,000) $ 0 136,000 $ 0      
Carbon Tech Limited [Member]              
Cash consideration received on transaction     $ 500,000        
Percentage of retained equity ownership interest disposed     25.00%        
Allowance for doubtful loans receivable         $ 1,000,000.0    
Equity Method Investment Realized Gain Loss On Disposal     $ 250,000        
Amount received at closing from interest sold     250,000        
Sale of interest, remaining amount     750,000        
Sale of interest, amount owned in twelve months     250,000        
Loan [Member] | Carbon Tech Limited [Member]              
Notes payable amount 750,000   750,000        
Allowance for doubtful loans receivable 750,000   750,000        
Debt, face value $ 3,000,000.0   $ 3,000,000.0        
Finbond [Member]              
Equity-accounted investments, ownership percentage 28.40%   28.40%   29.30% 28.40%  
Investment amount owned $ 6,900,000   $ 6,900,000     R 116.9  
Investment shares owned | shares 238,518,312   238,518,312     238,518,312  
Number of shares sold | shares   7,379,656   7,461,591      
Impairment loss on equity method investment     $ 1,100,000        
Share price per share | R / shares           R 0.49  
Liquidity discount     25.00%   15.00%    
Percentage of issued and outstanding shares owned by small group of shareholders     80.00%        
Equity Method Investment Realized Gain Loss On Disposal   $ (112,000)   $ 114,000      
Cell C [Member]              
Equity-accounted investments, ownership percentage 5.00%   5.00%   15.00% 5.00%  
Investment amount owned $ 0.0   $ 0.0   $ 0.0    
Cell C [Member] | Class A [Member]              
Investment shares owned | shares 75,000,000   75,000,000     75,000,000  
CPS [Member]              
Equity-accounted investments, ownership percentage 87.50%   87.50%   87.50% 87.50%  
Cedar Cellular [Member]              
Equity-accounted investments, ownership percentage 7.625%   7.625%     7.625%  
Mobikwik [Member]              
Equity-accounted investments, ownership percentage 10.00%   10.00%   10.00% 10.00%  
Carbon [Member]              
Investment amount owned         $ 0    
[1] (A) – Derived from audited financial statements