Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details)

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Stockholders' Equity (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jan. 31, 2016
Jan. 31, 2015
Jan. 31, 2016
Jan. 31, 2015
Jul. 31, 2015
Dec. 31, 2014
Stockholders' Equity (Details) [Line Items]            
Common Stock, Par or Stated Value Per Share (in Dollars per share) $ 0.01   $ 0.01   $ 0.01  
Maximum Offering Price Under Sales Agreement $ 20,000,000   $ 20,000,000     $ 20,000,000
Percentage of Commission Payable on Equity Offering     3.00%      
Proceeds from Issuance of Common Stock       $ 5,341,000    
Excess Tax Benefit from Share-based Compensation, Financing Activities 0 $ 0        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options 600,000   $ 600,000      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     17 months      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 100,000   $ 100,000      
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Outstanding Weighted Average Remaining Contractual Terms     18 months      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value     $ 21,000 $ 43,000    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares) 1,118,000   1,118,000      
Common Stock [Member]            
Stockholders' Equity (Details) [Line Items]            
Stock Issued During Period, Shares, New Issues (in Shares)       1,126,804    
Average Sale Price of Stock (in Dollars per share)       $ 4.89    
Stock Offering and Commissions Expenses       $ 169,000