Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details)

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Stockholders' Equity (Details) - USD ($)
 9 Months Ended
Apr. 30, 2017
Apr. 30, 2016
Jul. 31, 2016
Dec. 31, 2014
Stockholders' Equity Note [Abstract]        
Common Stock, Par or Stated Value Per Share (in Dollars per share) $ 0.01   $ 0.01  
Maximum Offering Price Under Sales Agreement $ 20,000,000     $ 20,000,000
Percentage of Commission Payable on Equity Offering 3.00%      
Excess Tax Benefit from Share-based Compensation, Financing Activities $ 0 $ 0    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options $ 1,400,000      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 20 months      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 10,000      
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Outstanding Weighted Average Remaining Contractual Terms 7 months      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value $ 19,000 30,000    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares) 333,000      
Stock Issued During Period, Value, Employee Benefit Plan $ 724,000 $ 709,000    
Stock Issued During Period, Shares, Employee Benefit Plan (in Shares) 91,541 160,352