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Shareholders' Equity (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Nov. 30, 2018
Oct. 27, 2018
Oct. 28, 2017
Jul. 31, 2018
Aug. 31, 2010
Cash Dividends [Abstract]          
Cash dividends paid   $ 900 $ 900    
Accumulated Other Comprehensive Loss [Abstract]          
Unrealized net foreign currency translation losses   (1,947)   $ (1,880)  
Unrealized net investment (losses) gains on available for sale investments   0   (5)  
Total accumulated other comprehensive loss   $ (1,947)   $ (1,885)  
Noncontrolling Interest [Member] | Lowham [Member]          
Noncontrolling Interest Items [Abstract]          
Ownership percentage       87.88%  
Noncontrolling Interest [Member] | Lowham [Member] | Forecast [Member]          
Noncontrolling Interest Items [Abstract]          
Ownership percentage 100.00%        
Noncontrolling Interest [Member] | Lowham [Member] | Maximum [Member] | Forecast [Member]          
Noncontrolling Interest Items [Abstract]          
Purchase of noncontrolling interest $ 100        
Class A Common Stock [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 Plan [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