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Stock-Based Compensation (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Apr. 10, 2017
USD ($)
shares
Jan. 05, 2017
USD ($)
Directors
shares
Sep. 09, 2016
shares
Oct. 31, 2016
USD ($)
shares
Apr. 30, 2017
USD ($)
Apr. 30, 2016
USD ($)
Apr. 30, 2017
USD ($)
shares
Apr. 30, 2016
USD ($)
Stock-Based Compensation (Textual)                
Class B common stock reserved for grant of awards under 2013 Plan | shares             1,503,532  
Stock-based compensation is included in selling, general and administrative         $ 97,000 $ 290,000
Officers and Employees [Member]                
Stock-Based Compensation (Textual)                
Granted restricted shares of Class B common stock | shares       164,000        
Fair value of granted restricted shares of Class B common stock       $ 4,392,000        
Officers and Employees [Member] | Minimum [Member]                
Stock-Based Compensation (Textual)                
Vesting period       2 years        
Officers and Employees [Member] | Maximum [Member]                
Stock-Based Compensation (Textual)                
Vesting period       4 years        
Jonas [Member]                
Stock-Based Compensation (Textual)                
Granted restricted shares of Class B common stock | shares 60,000     120,000        
Fair value of granted restricted shares of Class B common stock $ 2,144,000              
Vesting period 3 years              
Jonas [Member] | Vested one [Member]                
Stock-Based Compensation (Textual)                
Granted restricted shares of Class B common stock | shares       60,000        
Fair value of granted restricted shares of Class B common stock       $ 1,866,000        
Jonas [Member] | Vested two [Member]                
Stock-Based Compensation (Textual)                
Granted restricted shares of Class B common stock | shares       60,000        
Fair value of granted restricted shares of Class B common stock       $ 1,866,000        
Vesting period       3 years        
Consultant [Member]                
Stock-Based Compensation (Textual)                
Granted restricted shares of Class B common stock | shares     1,250          
Vesting period     13 months          
Directors [Member]                
Stock-Based Compensation (Textual)                
Granted restricted shares of Class B common stock | shares   24,000            
Fair value of granted restricted shares of Class B common stock   $ 886,000            
Number of directors | Directors   3            
Stock options [Member]                
Stock-Based Compensation (Textual)                
Stock-based compensation is included in selling, general and administrative         901,000 $ 605,000 5,188,000 $ 2,191,000
Unrecognized compensation cost related to non-vested restricted shares         $ 8,357,000   8,357,000  
Unrecognized compensation cost 2017             973,000  
Unrecognized compensation cost 2018             3,496,000  
Unrecognized compensation cost 2019             2,704,000  
Unrecognized compensation cost 2020             1,121,000  
Unrecognized compensation cost 2021             $ 63,000