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Shareholders' Equity (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Nov. 30, 2018
Jul. 31, 2018
Jul. 31, 2017
Jul. 31, 2016
Aug. 31, 2010
Cash Dividends [Abstract]          
Cash dividends declared   $ 1,724 $ 1,719 $ 1,895  
Dividends paid   1,700 1,700 2,100  
Dividends declared but unpaid   863 860 861  
Noncontrolling Interest Items [Abstract]          
Purchase of noncontrolling interest   27 0 0  
Accumulated Other Comprehensive Loss [Abstract]          
Unrealized net foreign currency translation losses   (1,880) (1,810)    
Unrealized net investment (losses) gains on available for sale investments   (5) 15    
Total accumulated other comprehensive loss   (1,885) (1,795)    
Noncontrolling Interest [Member]          
Cash Dividends [Abstract]          
Cash dividends declared   $ 0 $ 0 $ 0  
Noncontrolling Interest [Member] | Lowham [Member]          
Noncontrolling Interest Items [Abstract]          
Ownership percentage   87.88% 80.56%    
Noncontrolling Interest [Member] | Lowham [Member] | Forecast [Member]          
Noncontrolling Interest Items [Abstract]          
Ownership percentage 100.00%        
Noncontrolling Interest [Member] | Lowham [Member] | Maximum [Member]          
Noncontrolling Interest Items [Abstract]          
Purchase of noncontrolling interest   $ 100      
Noncontrolling Interest [Member] | Lowham [Member] | Maximum [Member] | Forecast [Member]          
Noncontrolling Interest Items [Abstract]          
Purchase of noncontrolling interest $ 100        
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 shares to combined classes of shares   10.00%      
Voting power of Class A common share holders to the Class B common share 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