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Stock-Based Compensation Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Jan. 31, 2019
Jan. 31, 2018
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award        
Granted, number of shares     273,000  
2006 Plan        
Share-based Compensation Arrangement by Share-based Payment Award        
Number Authorized (shares) 937,500   937,500  
2006 Plan | Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award        
Award Vesting Period, Minimum (years)     2 years  
Award Vesting Period, Maximum (years)     5 years  
Share-based Compensation Expense $ 229,000 $ 426,000 $ 889,000 $ 928,000
2006 Plan | Restricted Stock | Common Stock        
Share-based Compensation Arrangement by Share-based Payment Award        
Granted, number of shares 117,000 0    
2006 Plan | Restricted Stock | Common Class B        
Share-based Compensation Arrangement by Share-based Payment Award        
Granted, number of shares 7,000 0