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Shareholders' Equity (Details) - USD ($)
$ in Thousands
12 Months Ended
Jul. 31, 2019
Jul. 31, 2018
Jul. 31, 2017
Aug. 31, 2010
Cash Dividends [Abstract]        
Cash dividends declared $ 1,728 $ 1,724 $ 1,719  
Dividends paid 1,700 1,700 1,700  
Dividends declared but unpaid 865 863 $ 860  
Accumulated Other Comprehensive Loss [Abstract]        
Unrealized net foreign currency translation losses (2,098) (1,880)    
Unrealized net investment (losses) gains on available for sale investments 0 (5)    
Total accumulated other comprehensive loss $ (2,098) $ (1,885)    
Class A [Member]        
Class A and Class B common stock [Abstract]        
Percentage equity holders entitled to elect Board of Directors 25.00%      
Minimum percentage of the number of outstanding Class A common stock to combined classes of shares 10.00%      
Voting power of Class A common share holders to the Class B common stock holders 0.1      
Number of Class B shares to be converted into Class A shares (in shares) 1      
Stock Repurchase [Abstract]        
Number of shares authorized to be repurchased (in shares) 122,918     200,000
Remaining number of shares authorized to be repurchased (in shares) 77,082      
Number of share acquired (in shares) 0 0 0