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Stock-Based Compensation Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Apr. 30, 2017
Apr. 30, 2016
Apr. 30, 2017
Apr. 30, 2016
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award        
Exercised, number of shares 0 0 10,000  
Cash Received from Exercise of Stock Options     $ 170,000 $ 281,000
Tax Benefit Realized from Exercise of Stock Options     $ 80,000 $ 68,000
Options, Granted (shares)     0 0
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award        
Granted, number of shares     31,000  
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  
Granted, number of shares 0 500    
Share-based Compensation Expense $ 360,000 $ 324,000 $ 1,137,000 $ 962,000
2006 Plan - Director Stock Option | Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award        
Award Vesting Period (Years)     1 year  
2006 Plan - Employee Stock Options | Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award        
Annual Vesting Percentage     25.00%  
Number of years after grant date vesting starts (years)     2 years  
Number of consecutive years vesting occurs after initial vest date (years)     3 years