Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details)

v3.19.1
Stockholders' Equity (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jan. 05, 2018
Jan. 31, 2019
Jan. 31, 2019
Jan. 31, 2018
Jul. 31, 2018
Dec. 31, 2014
Jan. 14, 2011
Stockholders' Equity (Details) [Line Items]              
Common Stock, Par or Stated Value Per Share   $ 0.01 $ 0.01   $ 0.01    
Percentage of Commission Payable on Equity Offering     3.00%        
Maximum Offering Price Under Sales Agreement   $ 20,000,000 $ 20,000,000     $ 20,000,000  
Excess Tax Benefit from Share-based Compensation, Financing Activities     0 $ 0      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options   $ 1,400,000 $ 1,400,000        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     18 months        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period     238,230        
Performance Shares [Member]              
Stockholders' Equity (Details) [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period         3 years    
Restricted Stock [Member]              
Stockholders' Equity (Details) [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number   1,626 1,626        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value   $ 1.74 $ 1.74        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options   $ 11,000 $ 11,000        
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Outstanding Weighted Average Remaining Contractual Terms     24 months        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     0        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period     985        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value     $ 4,000        
2011 Plan [Member]              
Stockholders' Equity (Details) [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 5,000,000           3,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized 2,000,000            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   1,208,000 1,208,000        
Common Stock [Member]              
Stockholders' Equity (Details) [Line Items]              
Authorized Common Stock That May Be Issued And Sold Under Sales Agreement         $ 19,150,000    
Securities That May Be Sold Under The Agreement         $ 150,000,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period     34,719 228,704      
Stock Issued During Period Shares Stock Options Exercised1     23,376        
Directors And Officers [Member]              
Stockholders' Equity (Details) [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period   203,511          
Stock Issued During Period Shares Stock Options Exercised1     23,376        
Executive Officer [Member] | Performance Shares [Member]              
Stockholders' Equity (Details) [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     3 years   3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     81,500   32,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value     $ 229,000   $ 141,000