Fair Value Measurements (Details Textual)	3 Months Ended
Apr. 30, 2018
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

Description of the valuation processes in place for fair value measurements categorized within Level 3 of the fair value hierarchy.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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