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Fair Value Measurements (Details Textual) - USD ($)
 12 Months Ended
Jan. 31, 2017
Jul. 31, 2015
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Cost method investments, carrying value $ 0 $ 1,300,000
Other than temporary impairment charge 1,282,000  
Other Expense    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Other than temporary impairment charge $ 1,300,000  
Short-term investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair value, investment The fair value of the short-term investment, which is a guaranteed investment certificate, is based on its purchase price plus one half of a percent calculated annually